386 Annals of the South African Museum. 



explanation of these small differences, including the slightly longer 

 antennae. 



It may also be noted that, where in Miss Eichardson's text " only 

 one specimen, a female " occurs, " male " is evidently intended ; the 

 explanation to figure 18 is correctly given. 



Dr. Tattersall has kindly examined one of my young $ $ from 

 Tristan, and states that it is exactly the same as his from Gough 

 Island. 



Tattersall (I.e. p. 884) has suggested the possibility of S. stimpsoni, 

 Heller, S. leucura, White, and S. integra, Heller, being synonyms of 

 Leach's species. And to include S. stimpsoni and his own speci- 

 mens of S. tristense, he has emended the definition of the genus 

 Exospliaeroma. This emendation is now found to be unnecessary, 

 in view of the fact that S. stimpsoni $ has a telsonic notch and that 

 the adult $ of S. tristense is undoubtedly an Isocladus. 



As regards S. leucura I can express no opinion. S. integra, 

 Heller, the types of which I have examined, is certainly not 

 synonymous with the present species, although it should be placed 

 in the genus Isocladus. The three type specimens all have the 

 $ appendages on the 7th peraeon segment well developed and the 

 stylet on the 2nd pleopod free from the inner ramus, but it is 

 probable that the adult male with fully developed dorsal process has 

 not yet been found. 



Although a detailed description of /. integer (Heller) is hardly 

 within the scope of the present paper, the points in which it differs 

 from I. tristensis (Leach) may be briefly mentioned. The epimera 

 are larger and squarer, the 7th completely conceals the lateral 

 portion of the 2nd pleon segment, the telson is not so convex, 

 its flattened border proportionately larger, the apex blunter, the 

 outer ramus of uropods extending only slightly beyond telsonic apex, 

 the inner ramus with inner distal angle produced in a subacute 

 point reaching to, but not beyond the telsonic apex, outer margin of 

 inner ramus strongly convex (Heller's figure in Novara Crust. 

 pi. 12, fig. 8, is good, the left-hand inner ramus being quite 

 correctly drawn). 



GEN. CYMODOCE, Leach. 



1814. Cymodoce, Leach, Edinb. Encycl. vol. 7, p. 433. 

 1902. Stebbing, S.A. Crust, pt. 2, p. 73. 



1905. ,, id. in Herdman's Ceylon Pearl Fish. Suppl. Rep. 



23, p. 42. 



