REPORT ON THE CJECIDM 087 



10. Ccecum regulare, Carpenter. 



Ccecum regulare, Carpenter, Cascidas Monog., Proc. Zool. Soc. Lond., 1858, p. 428, sp. 22. 



Station 122. September 10, 1873. Lat. 9° 5' S., long. 34° 50' W. Off Pernambuco. 

 350 fathoms. Keel mud. One specimen. 



This specimen differs a little from Carpenter's description of Ccecum regulare, but not enough to 

 justify its erection into a separate species. 



11. Ccecum exile, de Folin (Cecid^e, PI. III. figs. 20-22). 



Caecum exile, de Folin, Caecidas of the Challenger Expedition, Proc. Zool. Soc. Lond., 1879, p. 811. 



Station 172. July 22, 1874. Lat. 20° 58' S., long. 175° 9' W. Tongatabu. 18 

 fathoms. Coral mud. One specimen. 



Testa minima, paululo subconica, arcuata, vitrea, diaphana, tenuis, nitida, primum 

 annulata, dein transversim striata, annulis minimis vix expressis, aperturam versus paululo 

 i nfiata. Apertura parum contracta, vix obliqua, marginata. Septo vix elevato, submamil- 

 lato, apice in medio sito. 



Length, 0-059 in. Breadth, 0'012 in. 



This pretty little species is somewhat broken at the mouth, but is otherwise perfect. It is 

 slightly conical, crystalline, translucent, glossy and very thin. On the upper part there are rings, 

 which though scarcely expressed are quite distinct under a magnifying glass. At about one-third 

 from the apex they are replaced by irregularly disposed striations. Towards the mouth the shell is 

 slightly dilated ; but just at the edge it is faintly constricted and then even more faintly reflected. 

 The septum is minute and very slightly elevated ia the form of a centrally rnamillated button. 



The species differs from Ccecum bipartitum, de Folin (Les Fonds de la Mer, vol. i. p. 185, pi. xxv. 

 figs. 9, 10) from Mexico, in size, thinness of shell, form of mouth and septum, and in sculpture. 

 From Ccecum semicinctum, de Folin (Les Meleagrinicoles, p. 42 ; Les Fonds de la Mer, p. 8) it differs 

 in size, thinness, arrangement and form of the rings, and in the form of its septum. 



12. Ccecum crystallinum, de Folin (Cmcivm, PI. III. figs. 23, 24). 



Caecum crystallinum, de Folin, Caecidoe of the Challenger Expedition, Proc. Zool. Soc. Lond., 1879, 

 p. 812. 



July 1875. Reefs off Honolulu. 40 fathoms. One specimen. 

 Length? Breadth, 0-012 in. 



An imperfect specimen, the upper part being broken off. It is evidently a new species, though 

 nearly related to Ccecum striatum, de Folin (Fonds de la Mer, vol. i. pp. 49, 170, pi. v. fig. 3), from which 

 it differs in that the shell expands towards the mouth and is thereafter contracted so as to form a minute 

 gorge, with a slightly reflected lip. At first sight it resembles Ccecum glalriformc, Carp. (Brochina) ; 



