ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 189 



Mediterranean fresh-water crab Telphusa fluviatilis. This new species 

 is said to resemble Distyla lipara Gosse, but to differ from it by being 

 more elongate, and by the total absence of an eye. No figure is given. 



Stan. Hlava * figures and describes Albertki bernardi, a new parasitic 

 species living in the intestine of Stylaria lacustris (Nais proboscidea). 

 The body is segmented, spindle-shaped, with a wing-like enlargement at 

 the posterior extremity ; foot small ; no eyes ; the head and mastax are 

 small ; the species is oviparous. 



Raffaele Isself describes and figures Balatro anguiformis, a new 

 species parasitic in the intestine of the 01igocha3te annelids Fredericia 

 bulbosa and Henlea ventriculosa, and which appears to differ from 

 B. calvus Claparede, mainly by the absence of the great postero-ventral 

 lobe. 



Echinoderma. 



Siamese Sea-Urchins4 — Th. Martensen reports on the regular 

 echinoids collected by the Danish expedition to Siam. Sixteen species 

 are dealt with, of which four are new, viz. C/modiadema granulatum, 

 Pleurechinus ddderleini, P. siamensis, and Gymnechinus pulchellus, the 

 first named being the type of a new genus. The author has used this 

 opportunity to revise the classification of the regular echinoids. 



Species of Cucumaria from Plymouth.§ — S. Pace points out that 

 two species have been hitherto confused as Cucumaria montagui Fleming, 

 viz. C. saxicola Brady and Robertson, and C. normani sp. n. 



New Crinoid.|j — W. Minckert describes Promachocriiws vanhbffenia- 

 nus sp. n., a littoral Antarctic form collected by the " Gauss " expedition. 

 He amends the definition of the genus, erects the new genus Decametro- 

 crinus [= Promachocriuus (pars)] P. H. Carpenter, and suggests the 

 new family Decametrocrinidaj for the two genera. This is the first new 

 discovery of a ten-rayed unstalked Crinoid since the " Challenger " days. 



Ccelentera. 



Development of Hydranths of Campanularidae and Plumularidae.ir 

 — Ormand Billard finds that the rudiment or primordium of the ten- 

 tacles forms in the young hydranths the outer margin ofl an annual 

 groove, surrounding a papilla which represents the future hypostome. 

 The tentacles, confluent to begin with, are first indicated by strands of 

 endodermic cells ; then they appear as slight denticulations ; then the 

 interspaces are incised to the level of the groove. 



Porifera. 



Phylogeny of Hexactinellid Sponges.** — E. A. Minchin, in speculat- 

 ing on this subject, makes the following suggestions. In the ancestral 

 form of these, and perhaps of all sponges, the gastral layer was in the form 



* Zool. Anzeig., xxviii. Dec. 1904. pp. 365-8. 

 t Archivio Zoologico, vol. 2, 1904, pp. 1-9 (1 pi.). 



% Mem. Acad. Roy. Danemark, I 'openhague, 7th Series, vol. i. No. 1 (1904) 

 pp. 1-124 (7 pis. and a map). § Journ. Marine Biol. Ass., vii. (1904) pp, 305-9. 

 || Zool. Anzeig., xxviii. (1905) pp. 490-501 (2 figs.). 

 % Comptes Rendus, cxxxix. (1904) pp. 1038-40. 

 ** Zool. Anzeig.. xxviii. (1905) pp. 439-48. 



