i8 2 DISCOVERY REPORTS 



developed in the form of solid triangular wedges, accommodated in shallow depressions in the right 

 valve. These teeth lie at either end of the featureless provinculum, two smaller teeth posteriorly, one 

 large tooth anteriorly. 



Lamellibranch larva ' B ' (Fig. 9) 



This species — at the more advanced stages present — is of larger size than larva 'A'. Its shape is 

 more orbicular with the beaks rather less prominent. The shell-length of the largest individuals is 

 approximately 500 /x, and the smallest, which just passed the straight-hinged D-shaped stage, measure 

 150/x in length. 



Fig. 8. Shell of lamellibranch larva 'A' from inshore station 

 WS 981, off Walfisch Bay. {Above) The hinge-line of the late 

 ' D-shaped stage ', the right valve towards the observer. 



Fig. 9. Shell of lamellibranch larva ' B ' from 

 inshore station WS 1002, off Orange River. 



Class CEPHALOPODA 



Subclass DlBRANCHIA 



Order DECAPODA 



Superfamily ARCHITEUTHACEA 



Four specimens of oigopsid larvae were present in the Benguela material, and — chiefly because of the 



incompletely known life-histories of oceanic decapods of the South Atlantic area — presented some 



difficulty in assigning to genera. Specific identification has not been ventured on, but by the kindness 



of Dr W. J. Rees, who has examined the material, I am able to provide the following notes. 



1 . A cranchiid larva, approximately 5 mm. in length, with the characteristic features of a bursiform 

 body, very short series of eight sessile arms, and protuberant or pedunculated eyes. The body is 

 unpigmented, and the eyes reddish brown. The specimen 'compares very favourably with the 

 juvenile Taonidium figured by Chun (1910), PI. 61, fig. 9'. 

 Occurrence. WS 976, 250-500 m. 



