ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 755 



New Parasitic Isopod.* — Harriet Richardson describes Scyraeepon 



hawaiiensis sp. n., one of those extraordinary Isopods, modified in rela- 

 tion to parasitism, and exhibiting striking sex-dimorphism. A male 

 and a female were found in the branchial cavity of Pilumnoplax cooki 

 in Globigcrina ooze in the Hawaiian region. Only one species of the 

 genus has been previously described, the type, Scyraeepon tuberculosa 

 Tattersall, parasitic on Scyramathia carpenteri Norman, found off County 

 Kerry, Ireland. 



Spiny Terrestrial Isopod. f — Harriet Richardson describes Globar- 

 madillo armatus g. et sp.n., from Guatemala. Its body is covered with 

 long spines, and both in its armature and general appearance it resem- 

 bles Acanthoniscus spiniger, described by Kinahan from Jamaica. 

 Notwithstanding the striking superficial resemblance of the two forms, 

 thev cannot be referred to the same genus. 



& v 



Development and Minute Structure of Scalpellum and Ibla.J — 

 F. H. Stewart gives an account of the post-larval development of the 

 hermaphrodite and of the male of Scalpellum squamuliferum. He has 

 notes on the structure of the male, the minute structure of the peduncle 

 in the hermaphrodite and male. He found no trace of the rudimentary 

 ovaries described by Gruvel in the male of S. peronii. Nor did he find 

 any trace of rudimentary testes in the female of Ibla cummingii. He also 

 describes the structure of the male of S. bengalense Annandale, the 

 post-larval development of the male of S. gruvelii Annandale, the 

 structure of the male of Ibla cummingii Darwin, and the sensory hairs in 

 various species. 



Rhizocephalous Crustacean from Fresh-water. § — Nelson Annan- 

 dale describes Sesarmaxenos monticola g. et sp. n., a Rhizocephalous 

 Crustacean from a crab, Sesarma thelxinoe, in a jungle stream 700 feet 

 above sea-level, in the Andamans. It is somewhat like Sacculina, slug- 

 like or sausage-shaped, and occurred between the ventral surface of the 

 carapace and the retroverted abdomen. It is attached by a chitinous 

 ring apparently without roots ; there are two slit-like orifices in the 

 mantle, surrounded and separated by a stout muscle ; the visceral mass 

 is apparently attached to the mantle by a mesentery that surrounds the 

 ring of attachment, being surrounded at all other points by a capacious 

 brood-pouch, which contains larva? of the Cyprid type. The mantle is 

 thin and smooth, but is well provided with slender circular muscle-fibres. 

 The two ovaries are distinct ; a testes has not been detected. This is 

 the first fresh-water Rhizocephalon. 



New Parasitic Copepods.|| — C. B. "Wilson describes and establishes 

 two new genera — Midias (intermediate between Caligus and Eurgphorus), 

 and Paralebion, in the family Euryphorinag, closely allied to Alebion. He 

 describes Achtheinus dentatus sp. n. and Lernseopoda inermis sp. n. 



* Proc. U.S. Nat. Mus., xxxviii. (1911) pp. 645-7 (6 figs.), 

 t Proc. U.S. Nat. Mus., xxxvii. (1910) pp. 494-7 (1 fig.). 

 % Mem. Indian Mus., iii. (1911) pp. 33-51 (4 pis.). 

 § Records Indian Museum, vi. (1911) pp. 1-4 (2 figs.). 

 « Proc. U.S. Nat. Mus., xxxix. (1911) pp. 625-34 (4 pis.). 



