REPORT ON THE GJECIBAL. 685 



5. Ccecum chinense, de Folin. 



Ccecum chinense, de Folin, Les Fonds de la Mer, vol. i. p. 80, pi. ix. figs. 3, 4. 



Station 186. September 8, 1874. Lat. 10° 30' S., long. 142° 18' E. Wednesday 

 Island, Cape York. 8 fathoms. Coral mud. Surface temperature 77°"2 F. Two 

 specimens. 



Compared with the original types, the Challenger specimens have the transverse striations 

 stronger, more regnlar, and more prominent, but they certainly belong to this species. 



6. Ccecum subflavum, de Folin (C^ecid^e, PI. II. figs. 13, 14). 



Ccecum subflavum, de Folin, Caecidae of the Challenger Expedition, Proc. Zool. Soc. Lond., 1879, 

 p. 810. 



Station 186. September 8, 1874. Lat. 10° 30' S., long. 142° 18' E. Wednesday 

 Island, Cape York. 8 fathoms. Coral mud. Surface temperature 77°"2 F. Two 

 specimens. 



Testa minuta, subcylindrica, paulo arcuata, primum albida, dein subflava, nitida, strigis 

 irregularibus plus minusve expressis transversim cincta, aperturam versus tumida ; infiatio 

 rotundata, transversim sulcata. Apertura leviter obliqua, tumore circumdata. Septo 

 haud elevato, bimamillato, seu mamillato-ungulato ; margine laterali undulato, paululo 

 convexo, fere piano decollationis parallelo. 



Length of entire shell, 0'1 in. ; length of the adult part, 0"07. Breadth, 0'016. 



In this specimen the adolescent shell is still united to the full-grown adult, whose septum can 

 be recognised within, through the thin walls of the earlier shell. A slight contraction of the tube 

 indicates the place where decollation was about to take place. Such specimens are occasionally to be 

 met with, and are very interesting. 



The species belongs to the pretty numerous group of smooth Cascums, all more or less nearly 

 connected. Among these may be mentioned in particular Ccecum auriculatum, de Folin, Ccecum 

 Mmamillatum, de Folin, Ccecum circumvolutum, de Folin, Ccecum massiliense, de Folin, Ccecum 

 modestum, de Folin, Ccecum strigosum, de Folin (see Les Fonds de la Mer) ; but from all of them 

 this species differs in the mouth or in the septum. 



In colour it is whitish near the apex and slightly yellowish towards the mouth. It is strongly 

 but irregularly striated transversely. Near the mouth, which is little oblique, there is a rounded 

 transversely furrowed varix bevelled off to a thin inner edge. The septum is bimamillated, having a 

 slightly larger and higher swelling on the side which lies near the concave curve of the shell. 



7. Ccecum succineum, de Folin (Cecid^e, PI. III. figs. 15, 16). 



Ccecum succineum, de Folin, Caecidas of the Challenger Expedition, Proc. Zool. Soc. Lond., 1879, p. 810. 



Station 186. September 8, 1874. Lat. 10° 30' S., long. 142° 18' E. Wednesday 

 Island, Cape York. 8 fathoms. Coral mud. Surface temperature 77° '2 F. Two 

 specimens. 



