8o 



for whilst the lower part of the tip is winged as usual, a special 

 terminal modification in the shape of a tapering pectinated 

 region occurs {vide "Challenger" Plates XXVII.A., figs. 24 and 

 25). The tips diminish in length from above downwards, and 

 the wings become broader, the pectinated region at the tip 

 being longer and more evident. The pectinations, indeed, are 

 visible in the developing bristle in the interior of the setigerous 

 lobe. The hooks had three or four small teeth above the 

 great fang, while the posterior margin forms an almost con- 

 tinuous and uniform curve with the ventral or basal margin, a 

 small mucro only indicating the separation. The posterior 

 hooks present very little difference in form. 



The examples were females laden with apparently ripe 

 ova. 



Marenzeller* considers that this form should fall under the 

 genus Lcpira, Malmgren, as shown by him in his careful classi- 

 fication of the group, and there is no objection to this arrange- 

 ment in the meantime. He procured various examples from 

 Angra Pequena-Bucht. 



Thelepus 



The examples of this form are much softened so that an 

 accurate description of the exterior is not possible. In general 

 aspect, however, they agree with Scottish forms of Thclcpits 

 cincimuitiis 



The hooks (Plate VII., fig. 37) have a well-marked dorsal 

 hollow, and the inferior margin terminates in a rounded process 

 which projects almost as far as the mucro above it. Only a 

 single hook occurs above the great fang. Posteriorly a 

 pointed process projects from the angle as in Grynuva, but there 

 is no tapering process beneath the mucro in front for the 

 attachment of the ligament as in Stirblosoiiia (Gryiiuva), which 

 also has two teeth above the great fang. A further noteworthy 

 feature is the tendency to the elongation of the stem of the 

 mucro ; and a slight tilting forward of the process as in Eiithclcpus 

 st'iiibdlt'iisis.'t The hooks of Tliclcpus sctosiis, De Quatrefages, as 

 figured by De St. Joseph $ in his well-known *' Annelides Poly- 

 chetes des Cotes de Dinard," approach the South African form 

 very closely. The chief differences are the presence of two 

 hooks above the great fang, the less graceful curve of the base 

 and the more erect mucro in the French form. 



* Sitzunjish. d. k. Akad. d. Wiss. i Abth. Jhnji, 1S.S4, p. iX, etc. 

 t Ann. "Challenger," p. 465, PI. xxviii.A, tig. 13. 

 + Ann.Sc. Nat. 8e Ser., xvii., p. 230, PI. lo. i. 260. 



