253 Part III. — Tiventy -second Annual Report 



This parasite, which appears to differ from any other Sphceronella 

 known to me, measures '74 mm. in length (about -^ of an inch). Its form 

 is almost globular, especially the dorsal view, but seen from the side the 

 height is rather less than the width (fig. 28, 29). 



The only appendages that could be satisfactorily made out were the 

 second maxillipeds, and these are moderately elongated and slender, and 

 are each provided with a slender terminal claw (fig. 30). 



There does not appear to be any previous record of a Sphceronella 

 having been found on Harpinia pectinata. 



Sphceronella pygmcea, T. Scott, sp. n. PI. xv., fig. 31-34. 



The adult female of this species represented by the drawings (fig. 31 

 and 32), whether viewed dorsally or from the side, is seen to be of a 

 nearly oval form, the length being equal to about one and a half times 

 the breadth. This parasite, which is very small, measures only *49 mm. 

 in length (about Jy °f au inch). 



The antennules and antennae appear to be rudimentary, while the only 

 appendages of which a satisfactory examination was made were the first 

 and second maxillipeds represented by the drawings (fig. 33, 34). 



The first maxillipeds, .which are very small and uniarticulate, are armed 

 with a moderately stout terminal claw (fig. 33). 



The second maxillipeds are elongated and three-jointed ; the inner 

 distal angle of the first joint is produced' so as to form a small bifid 

 projection ; the first and second joints are sub-equal in length ; the third 

 is small and narrow, and bears a somewhat feeble terminal claw (fig. 34). 



Habitat. — This small Sphceronella was obtained in the marsupium of a 

 specimen of Pseudocuma similis, G. 0. Sars. No males or post-larval 

 females were observed. 



There does not appear to be any previous record of a Sphceronella 

 from this species of Pseudocuma. 



Sphaironella amphilochi, H. J. Hansen. PI. xv., fig. 35, 36. 



1897. Sphceronella amphilochi, H. J. PL, op. cit., p. 139, pi. vii., 

 fig. 3 a and b. 



The Sphceronellu I record under this name was found in the marsupium 

 of Amphilochoides odontonyx (Boeck) (= Amphilochoides pusillus^ G. 0. 

 Sars).* The specimen represented by the drawing (fig. 35) is a young 

 female, and as Dr. Hansen has only described the adult form of the 

 species from a solitary example, a satisfactory comparison between our 

 specimen and his description and figures could not be made. Dr. 

 Hansen's specimen was, however, found on the same species of Amphipod, 

 and this favours the identification of the two parasites as beiug the old 

 and young females of the same species. The young female I am 

 recording measured only *14 mm. in length (about y^- of an inch), but 

 the size of the adult described by Dr. Hansen was *54 mm. 



A specimen which appeared to be an adult female was taken from the 

 marsupium of the same Amphipod in which the young one now recorded 

 was obtained, but it was somehow lost ere it could be thoroughly 

 examined and figured. 



The posterior part of the body of the young female is distinctly hispid, 

 and the thoracic legs were furnished with long and slender terminal hairs, 

 as shown in tig. 35. Near the middle of the dorsal aspect a number of 

 slender bristles were observed. 



* Crustacea of Norway, vol. i. (Amphipoda), p. 222. See also the supplement to the 

 volume, p. 690, where the author restores Boeck's name, A. odontonyx, for the name used 

 in the body of the work. 



