54 



particular, for the licad is strongly produced in front into a 

 somewhat upturned rotundo-quadrate process, the sides of which 

 are even a little incurved before diverging- towards the eyes. 

 From the autiiors mentioned one must infer that the process in 

 then- specimens, though more or less blunt at the top, was other- 

 wise triangular. 



The nearest approach .in other described species of Rociiida to 

 the shape of the process exhibited by the African specimen is in 

 R. oculata, Hargcr, 1883. but that species is distinguished from 

 R. dinncrilii by being much broader in comparison with the 

 length, by having the eyes contiguous instead of separated, and 

 J)y having the inner ramus of the uropods slightly shorter than 

 the outer, instead of distinctly longer. 'According to Bovallius. 

 in the adult male of dnmcrilii the front of the head " shows an 

 obtuse projection shorter than in the ovigerous female, but 

 longer than in the virgo." Grubc distinguished his Achcnisia 

 lomplanata from dnmcrilii only on the ground that its first pleon 

 segment did not run out into strongly-])ro(luced joints, such as 

 are shown in the figure given by Lucas, and the same distinction 

 might be drawn for the African specimen, in which the first pleon 

 segment is much less wide than those that follow- although its 

 apices are sharper than theirs, but Schiodte and Meinert explain 

 that in the ovigerous female the first pleon segment is in fact 

 almost entirely concealed, though in the " virgo" it is broad and 

 pretty fully unco\-cred. In their account they say that the tarsus 

 (sixth joint) of the prehensile feet has three sharp spines in the 

 ovigerous female, four in the " virgo." In the African specimen 

 the joint in question has four spines, and the Danish authors 

 figure four for both forms. 



The eyes are large and dark, composed of about 140 ocelli- the 

 facets easily catching the light. The well-marked medio-dorsal 

 depression on the head, described by Lucas, is present. On the 

 other hand, the longitudinal furrow on the telsonic segment 

 which he says is pretty well marked- is rather to be imagined 

 than perceived. Schiodte and Meinert speak of it as " lightly " 

 shown in the ovigerous female, and '' very lightly " in the 

 "virgo." The colouring and size (an inch long), and all details 

 except the frontal process, so well agree with earlier descriptions 

 and figures of R. dinncrilii that it would be rash to form a new 

 species for this single specimen- 

 Locality :— Vasco de Gama Pt. S. 7,^ E. 13! miles. Depth, 

 166 miles. 



Fam.: Cv^^OTITOIDA^:. 



1900- Cymothoidac. Steljbing- .South African Crustacea, Part i, 

 V- 55 ; ^"^ Willey's Zool. Results, Part 5, p. 630. 



