374 Annals of the South African Museum. 



Pleopods 1-3, peduncle with 3 hooked setae ; inner ramus in 1st 

 and 2nd half as long again as outer ; rami in 3rd subequal ; male 

 stylet on 2nd 2| times as long as ramus, apically enlarged into an 

 ovate spatulate form, the inner margin with recurved serrations. 



Uropods not reaching telsouic apex, inner ramus subtriangular, 

 widening distally, distal margin excavate, outer ramus much smaller 

 than inner, ovate, apically blunt. 



Length: 5mm.; breadth: 2'5 mm. 



Colour: In spirit, whitish-brown, the tubercles and telsonic processes 

 whiter than the rest. 



Locality: Cove Bock KE. by E.| E., distant 4 miles (off East London). 

 22 fathoms. 1 <J. s.s. "Pieter Faure." 6/8/01. (S.A.M. No. A3831.) 



This pretty species is named after the cancellate appearance of the 

 sculpturing on the peraeou segments. A somewhat similar develop- 

 ment of dorsal tubercles is found in two other South African Sphae- 

 romids : Exosphaeroma yorrecium Brnrd. and Sphaeramene polytylotos 

 Brnrd. 



GEN. CASSIDIAS Eich. 



1916. Cassidias Eichardson, Proc. U.S. Nat, Mus. vol. 31 [1907], p. 20. 

 1910. Thielemann, Abh. K. Bay. Ak. Wiss. II. Suppl. Bd. 3 



Abh. p. 56. 

 1914. Vallentinia Stebbing, Proc. Zool. Soc. Lond. 1914, p. 351 (iiom. 



preocc.). 

 1914. Euvallentinia id. ibid. p. 944. 



In 1905 Hausen suggested that a new genus was necessary for 

 Cunningham's Cymodocea darwinii and in 1914 Stebbing acted on 

 this suggestion, apparently overlooking the fact that Miss Eichardson 

 had already in 1906 instituted a suitable genus, and indeed had placed 

 C. darwinii in it. This genus is Cassidias, of which the type-species 

 is C. argentinea Eich. 



Eichardson's definition of the genus is as follows : " Mouth-parts 

 of 9 metamorphosed. Seventh segment of thorax not produced back- 

 wards in any process. Abdomen composed of 2 segments, the 1st of 

 which is not produced backward in a median process. Terminal 

 abdominal segment with a narrow notch, which is sometimes concealed 

 dorsally, but a groove is formed beneath by the infolding of the 

 margins. Both branches of the 4th pair of pleopods are similar, fleshy, 

 with transverse folds and without marginal setae. The exopod of the 

 3rd pleopod is 2-jointed. The branches of the uropods are similar, 

 the outer one being capable of folding under the inner one." 



