1898,] FEOM FUIfAFITTI AND EOTUITA. 835 



In noting the horizontal distribution I have employed the 

 terms used by Dr. A. E. Ortmann in his ' Grundziige der mariuen 

 Tiergeographie,' 1896 ; in giving the size of specimens I have 

 taken greatest length and greatest breadth. 



The collection comprises examples of 12 species of Aspidochirota, 

 1 Dendrochirotan, and 5 species of Synaptidse (one of which is 

 new) ; the following is a list : — 



List of Species. 



1. Actinopyga [Miillericij echiniies Jaeger ?, p. 836. 



2. [ ] maiiritiana Quoy & Gaimard, p. 835. 



3. [ ] parvula Selenka, p. 836. 



4. Holothtiria atra Jaeger, v. andioinensis Semper, p. 839. 



5. difficilis Semper, p. 838. 



6. fuscocinerea Jaeger, var. pervicax Selenka, p. 837. 



7. impatiens ForskSl, p. 840. 



8. maculata Bi-audt, p. 842. 



9. 'nionacaria Lesson, p. 841. 



10. ■pardalis Selenka, p. 839. 



11. rugosa Ludwig, p. 839. 



12. vagahimda Selenka, p. 842. 



13. Pseudocucwmis africana Semper, p. 843. 



14. Sj/napta godeffroyi Semper (genus Euapta Ostergren), p. 847. 



15. kefersteini Selenka (genus Chondrodea Ostergren), p. 847. 



16. ooplax V. Marenzeller (genus Synapta Ostergren), p. 848. 



17. Chiridota intermedia, sp. nov., p. 846. 



18. liberata Sluiter, p. 845. 



As will be seen, I propose to combine Actinopyga parvula 

 Seleuka and A. jiavocastanea Theel under the former specific name, 

 and Holothuria fuscocinerea Jaeger et Semper with Holothuria 

 pervicax Selenka. 



Most of the species in the collection are widely distributed 

 tropical forms, but I have thought it worth while to note any 

 discrepancies between the individual specimens and the specific 

 descriptions. The variations in the tentacles of Pseuclocucumis 

 africana Semper seem to be of interest from several points of 

 view. 



From the list of species it will appear that there is one which I 

 believe to have beeu hitherto undescribed and which I have called 

 Chiridota intermedia. As is well known, the species of Chiridota 

 are very difficult to diagnose and separate from one another ; the 

 attempts that have been made to classify them on the minute 

 structure of their wheels have not met with much success, and 

 until more is known of the changes which take place during the 

 growth of the individual, the specific differences must appear 

 unsatisfactory — at any rate, the present species seems to be at least 

 as definite as most others of the genus. 



AsPIDOCHIROTjE. 



Actinopyga maiiritiana Quoy & Gaimard. 



Holothuria mauriiiana Quoy & Gaimard, Voyage de I'Astrolabe, 

 iv. Zooph. 1833, p. 138. 



