This study is a follow up of the work that has been done based on a new collection of glass sponges on the monographic works of the early sponge taxonomist experts, mainly Isao Ijima (1861 – 1921), who described many of the knwon, still valid Hexactinellid species. The purpose of this research is a thorough investigation of Sagami Bay Hexactinellid species collected in 2004, their description, including new species and their documentation, including modern methods. eg electron microscopy and computer tomography (CT). It is also aimed at the comparison of taxonomic composition from our findings with the taxa described by I.Ijima from this area in the beginning of last century. Another aim of this study is to track down possible reasons – climatic /environmental /directly anthropogenic and consequences differences and/or similarities in the faunal composition of glass sponges in the Sagami Bay within last century. During the first period of this study (September – December 2024) 75 species have been identified, based on morphology, organization of the internal sponge collagen skeleton and its skeletal elements (spicules), microscleres. From the current data, the predominant genera in the collection are Hyalonema and Eurete. The highest abundance has been recorded for Hyalonema. In the remining period of the DBU fellowship, the study will continue with species identification from the rest of the existing Hexactinellid collection, comparison with the findings from Ijima data analysis of reasons of possible differences and/or similarities between them.