MARINE WOOD-BORIXG ANIMALS. 217 



Hansen has already stated that this species is to be included in 

 the genus Sphceroma as restricted by him. Ovigerous females 

 in the Brisbane collection agree with his definition of the genus 

 in having large overlapping oostegites, while the eggs (and 

 embryos) are contained in internal pouches opening by four 

 pairs of large slits on the sternal surface, as in 8. rugicauda and 

 /J?, serratum. 



A large number (well over a score) of males have been ex- 

 amined, which, from their size (up to 9*5 mm. in length), from 

 the fact that they were found in the same gathering with 

 ovigerous females and from the presence on the last thoracic 

 sternite of a pair of penes, would ordinarily be regarded as 

 adults. Two individuals were dissected and found to have the 

 vasa deferentia distended with bundles of filiform spermatozoa. 

 Nevertheless, in no case was there a trace of an appendix 

 mascidina or even of a marginal thickening on the second 

 pleopods *. Hansen states (op. cit. p. 88) that an appendix 

 mascidina is present in adult males of all the genera of Sphsero- 

 midse except Dynamene and Ancinella, but he notes that in the 

 subfamily Sphceromince it "does not appear before the animals are 

 nearly full-grown," while the penes are present at a much earlier 

 stage. His account of Cymodoce pilosa (op. cit. p. 89) suggests 

 caution in deciding as to the sexual maturity even of large 

 individuals. Nevertheless, the conclusion seems to be justified 

 that the appendix mascidina is not developed in Sphceroma tere- 

 brans, which in this respect forms an exception among the 

 species of the genus. 



Crustacea associated with S. terebrans. — Stebbing has recorded 

 the occurrence of the little Asellotan Iais pubescens in association 

 with 8. terebrans at Ceylon. He had previously given an extended 

 description, with figures, from specimens taken on Exosphceroma 

 gigas at the Falkland Islands (Proc. Zool. Soc. 1900, p. 549, 

 pi. xxxviii.). The collection of S. terebrans from Brisbane includes 

 numerous specimens, and that from Natal a solitary young specimen 

 of what is probably the same species. Some of the Brisbane speci- 

 mens carrying eggs do not exceed 2 24 mm. in length (Stebbing's 

 Falkland specimens reached 2-5 mm.). They have not more 

 than 13-14 segments in the flagellum of the antenna, the uropods 

 are nearly half as long as the abdomen, and the exopod of the 

 uropods is much longer than the peduncle and definitely longer 

 than the endopod. 



Specimens found on Exosphceroma gigas from the Auckland 

 Islands differ from these and agree with Stebbing's Falkland 

 Island specimens in having more numerous segments in the 

 flagellum of the antenna (22, while Stebbing records "attaining 

 to 25 "), the uropods not more than one-third as long as the 

 telsonic segment, and the exopod of the uropods equal to the 



* Barnard notes the absence of the appendix mascidina in the single male (9 mm. 

 in length) examined by him. 



