70 Annals of the. South African Museum. 



A female 160 mm. long (with telson slightly imperfect) has a 

 thelycum corresponding with that figured by Alcock for 

 P. monodon, which de Man supposed later to he P. semi- 

 sulcatus. In this specimen the rostrum has 5 small ventral 

 teeth instead of the usual three. 



Locality. Delagoa Bay. A 2128-9. The specimen was 

 obtained by Mr. K. H. Barnard in October 1912. 



GEN. PENAEOPSIS, A. Milne-Edwards. 

 (For synonymy see these Amials, vol. 15, part 1, p. 15, 1914.) 



PENAEOPSIS MONOCEKOS (Fabricius). 



1798. Pcnaens monoceros, Fabricius, Supplementum Ent. Syst., 



p. 409. 

 1906. Metapeneus monoceros, Alcock, Catal. Indian Macrura, p. 18, 



pi. 3, figs. 7, la-c. (with synonymy). 

 1911. Penaeopsis monoceros, de Man, Siboga Exp., vol. 39, pp. 8, 55. 



1913. ,, ,, de Man, Siboga Exp., vol. 39, Suppl., 



pi. 6, figs. 14a-c. 



1914. ,, ,, Balss, Abhandl. K. Bayer, Ak. Wiss., 



vol. 10, Suppl. 2, p. 7. 



Dr. de Man distinguishes two sections in this genus. The 

 first, to which this species belongs, he defines as follows : 

 " No marginal subterminal articulating spines on the telson ; 

 last pair of thoracic legs without exopod ; their merus in the 

 adult male, with a notch and spine or tooth at its proximal 

 end." The presence of this tooth in the adult male helps to 

 distinguish this species from P. spinulicauda, Stebbing, 1914. 



The specimen examined has 9 dorsal teeth on the carapace, 

 the hindmost remote from the others, the end of the rostrum 

 slightly upturned. The carapace has a length of 37'5 mm., 

 the rostrum from the base of the eyes accounting for 15'5 mm. ; 

 the pleon is 68'5 mm. long, bringing the total to 106 mm. 

 The flagellum of the second antenna measured 180 mm., this 

 being probably its full extent, as it had to be extracted from 

 what appeared to be secure shelter within the carapace and 

 other parts of the animal. The slender fifth peraeopods were 

 also protected by the carapace. Another specimen, 116 mm. 

 long, has the flagellum of second antennae 225 mm. long, the 

 flagella of the first pair only about 10 mm. in length. 



