APPENDIX. No. IV. 413 
PENTALASMIS.* ° 
Divisions of the genus. 
* Hinder scale simply arcuated. _ Lateral scales smooth. 
** Hinder scale simply arcuated. Lateral scales costated. 
*** Hinder scale abruptly bent below the middle. 
Sp. 1. Pentalasmis (*) Chelonia. Superior scales broad, rounded at their points, 
hinder scale convex. Found on ‘turtles in N. lat. 36, 15, 0 W. long. 
16, 32, 0. Page 9. 
Sp. 2. Pentalasmis (*) Hillii. Superior scales narrow, anteriorly obliquely-trun- 
cated ; (hence as if produced behind), hinder scale carinated below. 
Sp. 3. Pentalasmis (**) Spirule. Rather convex, upper scales with their points 
anteriorly produced. 
8 With the ribs spined. Found in great abndance adhering to the floating 
shells of Sprrutx. (to which in several specimens part of the animal still 
adhered) 22, 0, ON. lat. 19, 17, 0 W. long. 
Sp. 4. Pentalasmis (**) dilatata. Larger scales anteriorly dilated, hinder scale 
with granulated striae (often behind with two or four teeth.) 0, 14, 0, N. 
lat, 6, 18, 52, E. long. adhering to Janthina fragilis. 
Sp. 5. Pentalasmis (***) Donovani. Hinder scale, with a longitudinal elevated 
little line; angle rectangular ; bend obtuse with a transverse elevated little 
line. Taken in 0, 38, 0 S. lat. 7, 50, 0 E. long, 
Sp. 6. Pentalasmis (***) Spirulicola. Hinder scale narrow carimated from the 
apex to the angle ; angle rectangular, geniculated, promment. Found on 
shells of Spirula, 22, 0, 0 N. lat. 19, 17, 0 W. long. 
CRUSTACEA. ig 
: Me ; : 
Portunus, (a new species,) without spines on the front aspect of its arms, was 
taken in the Gulph of Guinea. 
Tupa ; of this genus three new species were discovered, all of which belong’to 
that section in which the hinder lateral spine of the shell is very much 
elongated. 
Macherus ; a new genus allied to Gonoplax, but differing in having short 
* The peduncle of those of the first division is very long, or moderately so; of the 
two other divisions extremely short. 
