290 DISCOVERY REPORTS 



Third and fourth pedigerous somites divided dorsally only by a suture line, the fifth with its anterior 

 border finely serrate, and with the sides acutely produced rearwards, reaching half-way along the first 

 pleon somite. 



Fifth pleon somite with the sides produced at the posterior end to form a prominent tooth, with one 

 or two smaller teeth set on each side anteriorly. The telson about as long as the fifth and sixth pleon 

 somites combined, the distal section twice as long as the proximal, with thirteen pairs of lateral and 

 two terminal spines. 



The first antenna with the second joint of the peduncle the shortest; principal flagellum with four 

 joints, ending in two aesthetascs; accessory flagellum three-jointed. Second antenna and mouth- 

 parts as in D. laevis. 



The first peraeopod with the second joint shorter than the rest of the appendage, without spines. 

 The second peraeopod with the fifth joint about as long as the sixth and seventh combined; the third 

 joint with two small teeth on the lower edge. No exopods on the third and fourth pairs. The peduncle 

 of the uropods longer than the telson, with about twenty spines on the inner edge; the exopod longer 

 than the endopod ; the endopod with the first joint shorter than the second and third combined, with 

 7.3.3 spines on its inner margin. 



Adult male. Length 10 mm. Carapace longer than in female, three times as long as high; antero- 

 lateral corners rather more produced, with about five more prominent teeth. On each side there is a 

 carina extending forward about two-fifths of the length; carapace otherwise smooth, without oblique 

 transverse folds. The fifth pedigerous somite more produced behind than in the female. The pleon 

 somites armed with prominent spines. The flagellum of the second antenna reaching beyond the 

 uropods. 



Colour of the female yellowish-white; the male similar with reddish-brown pigment in the basal 

 joints of the peraeopods, especially in the exopods, and in the pleopods, and with two lateral spots on 

 the first pleon somite. 



The species is rather similar in general form to D. laevis, but may easily be distinguished by the more 

 prominent backward projection of the fifth pedigerous somite and by the spines at the sides of the 

 fifth pleon somite ; in the male it differs in the absence of oblique folds on the carapace and in the 

 presence of pigment which is fast for some time in alcohol. From D. algoae Zimmer it is easily dis- 

 tinguished by the absence of an emargination in the pseudorostrum of the female, by the shape of the 

 carapace, and by several details of the appendages. 



REFERENCES 



Bate, S., 1856. On the British Diastylidae. Ann. nat. Hist. (2), xvm, p. 157. 



Bonnier, J., 1896. Edriophthalmes. Res. scient. Camp, du 'Caudan'. Ann. Univ. Lyon, xxvi, pp. 527-689. 



Copenhagen, W. J., 1953. The periodic mortality offish in the Walvis region. Fish. Div., Dept. of Commerce and Industries, 



Union of S. Africa, Invest. Rep. xiv, pp. 1-35. 

 Currie, R. I., 1953. Upwelling in the Benguela Current. Nature, clxxi, pp. 497-505. 

 Fage, L., 1928. Cumacis de la c6te atlantique du Maroc. Bull. Soc. sci. nat. Maroc, vin, pp. 173-81. 

 Fage, L., 1945. Les Cumaces du plancton nocturne des cdtes d'Annam. Arch. Zool. exp. et gen. lxxxiv, pp. 165-224. 

 Fage, L., 1951a. Cumaces. Faune de France, liv, pp. 1-136. 

 Fage, L., 1951 b. Cumacis. Exp. oceanogr. Beige dans les Eaux cotieres africaines de 1' Atlantique Sud (1948-1949), m, fasc. 1, 



pp. 1-9. 

 Forsman, B., 1938. Untersuchungen tiber die Cumaceen des Skageraks. Zool. Bid. fr. Uppsala, xvm, pp. 1-161. 

 Goodsir, H., 1843. Description of the genus Cuma and of two new genera nearly allied to it. Edinb. new phil. Journ. xxxiv, 



pp. 119-80. 

 Hale, H. M., 1944. Australian Cumacea. No. 8. The family Bodotriidae. Trans. Roy. Soc. S. Australia, lxviii, pp. 225-85. 

 Hale, H. M., 1953 a. Two new Cumacea from South Africa. Trans. Roy. Soc. S. Australia, lxxvi, pp. 45-50. 



