276 



MR. f'YRIL CROSSLAXD OX THE 



[Feb. 16. 



The following table gives the sizes of the uncini in the four species 

 known* : — 



Position on bodj'. 



1. Last neuropodium of A 



2. 1st neuropodium of B .. 



.3. Lateral tori of C 



4. Ventral tori of C 



C. variopedatus 

 Crossland. 



Size in 

 mm. 



f -iiex-os 



1 -110 X -046 



•110 X -046 

 •08 X -026 



No. of 

 free f 

 teeth. 



usually 8, 

 sometimes 6 



7 or 8 



8 or 9 



C. variopedatus 

 Marenzeller. 



Size v. 

 mm. 



•Ill X -048 



•081 X -045 

 •051 X -021 



No. of 

 free f 

 teeth. 



( 11, 

 (rarely 12 



C Inngimanus. 



Position on body. 



1. Last neuropodium of A , 



2. 1st neuropodium of B... 



3. Lateral tori of C 



4. Ventral tori of C 



Size in 

 mm. 



No. of 

 freef 

 teeth. 



■131X^06 

 •11 X -045 



{:;ox-o5 



•06 X -025 



6 or 7 



7 or 8 



C. longipes. 



Size in 



jNo. of 

 free f 

 teeth. 



Absent. 

 •05X^026 

 •046 X -024 

 •032 X -012 



4 or 5 



7 



C. cautus 

 Marenzeller. 



Size in 

 mm. 



•084 X •036 

 •084 X -036 



smaller 



No. of 

 freef 

 teeth. 



6, 

 rarely 7 



6, 

 rarely 7 



I 



rarel v 

 L 9 or io 



The deep brown uncini of the last segment of A in C. longi- 

 mmius are thus larger, and the remainder are as large as the 

 corresponding ones of C. variopedatus in spite of the smaller size 

 of the body of the former species. The numbers of the teeth are 

 smaller. In 4 of the table above their shape is the same for both 



* In the only American specimen I have been able to examine, uncini of lateral 

 tori of C have 10-12 teeth, of ventral tori 15-18. Perhaps this species, C. perga- 

 mentaceus, may be shown to be distinct when more material is examined. 



f Following Marenzeller in leaving out of the reckoning the last rudimentary 

 tooth which may or maj' net be developed. 



Although tlie uncini of different individuals are variable (cf. my measurements 

 and those bj' Marenzeller), the variations are in all specimens of the four species in 

 the same direction, the sizes in all the columns getting smaller towards the bottom, 

 the numbers of the teeth greater. De St. Joseph, who examined only three speci- 

 mens, also gives an incomplete list of measurements of uncini, which nieasurenienls 

 are all slightly different from m^• own and those given by Marenzeller. 



