59 



■shorter, and absolutely as well as relatively wider than it is in 

 the otiier pairs; also on its outer surface this joint is armed with 

 a great number of pectinate spines, which are wanting- in the 

 other pairs. The second joint is deeply channelled along the 

 front, the third and fourth joints are distally widened, lobed cjn 

 -each side; the fifth joint is^very short, not under-riding the sixth; 

 the sixth obtains a subchelatc character by help of a strong sub- 

 l)asal spine confronting the^finger, this spine being to appearance 

 roughened with rows of minute teeth extending from aiear the 

 base quite to its apex. The finger is biunguiculate. groups of 

 setules or slender spines attending the stronger outer nail and 

 the shorter inner one. 



Second gnathopods and the perseopods — There is a gradual 

 increase in the length of the limbs, the sixth joint becoming 

 narrower and longer, but the dififerences otherwise not being 

 very material- In all the hmbs the peculiar denticulate spine of 

 the sixth joint is conspicuous, and the finger shows an impression 

 •on the inner surface where its base rests against the circular apex 

 •of tb sixth joint. 



The pleopods do not seem to differ from those in the genus 

 Idotrn. 



The uropods^ — These also are in close agreement with those of 

 Idofca. The ramus is more than a third of the length of the 

 peduncle, at its base nearly as broad as the length, which is 

 grei r on the convrx outer than <n chestraighi siii-^r margin, 

 the apical being obliquely truncate and fainfy emarginate, 

 rather more than half the basal breadth. There is no other plate, 

 but a strongly plumose setge about half as long as the ramus, and 

 ■by this possibly the outer ramus is represented. 



The colour in formalin is orange, with a pair of bright red 

 spots on the front margins of the perseon segments from the 

 second to the seventh- Small spots and stellate markings are 

 visible under the microscope on many parts, including the maxil- 

 lipeds, uropods, etc. 



Length, about 24 m,m- The single specimen carried numerous 

 eggs within the four pairs of marsupial plates, and could not be 

 flattened out for minutely exact measurements. Krauss gives 

 the size of the specimen taken in the algae of Table Bay as length 

 I inch, breadth Tf-y lines. 



Locality : — Dredged between Bird Lsland and the main- 

 land, Algoa Bay, in 10 to 16 fathoms, on a bottom of sand, 

 shells, and stone. 



Gex. : SvNiDOTEA. Harger- 



1878. Synidotea, Harger, Amer. Jour. Sci-, ser. 3, vol. 15, p. 3/4- 

 1880. Synidotea, Harger, U.S- Fisheries Report for 1878, pt. 6, 

 P- 350. 



