CRUSTACEA. 
615 
Mid'odeuteropus vesiculatus (Bate) and ivehstcri (Bate). Remarks by 
Norman, Rep. Brit. Assoc, for 1868, p. 282. 
Megampliopus (gen. nov.) cornutus, sp. n., Norman, Rep. Brit. Assoc, for 
1868, p. 282, Shetland Islands. 
Protomedeia pectinata, sp. n., Norman, ibid. p. 283, Shetland Islands j with 
remarks on Protomedeia? ivhitei (Bate) and hirstdimana (Bate). 
Gammarm pideanm (Koch) is not blind, but sensible to light. Plateau, 
Ann. h Mag. Nat. Hist. iii. p. 13. 
Melita ohtusata. Melita proxima and Gammarus ohtusatus are male forms, 
Megamcera alderi is the female. Norman, Rep. Brit. Ass. for 1868, p. 284, 
ami Ann. & Mng. Nat. Hist. iii. p. .369. 
Exunguin, gen. nov. Most nearly allied to Cratippmy but first gnathopods 
long, slender, filiform, with obsolete dactylus. Flagella of both antennm 
rudimentary. E. stilipes, sp. n., Norman, Ann. & Mag. Nat. Hist. iii. p. 369, 
pi. 22. figs. 7-12, Birterbuy Bay, West Ireland. 
Cyrteyphium armatunij sp. n., Norman, Rep. Brit. Assoc, for 1868, p. 286, 
Shetland Islands. 
Corophium honellii (B. & W.) is the female of C. cj'assicorne (Bruzelius), 
Norman, Rep. Brit. Assoc, for 1868, p. 286, and Ann. & Mag. Nat. Hist. iii. 
p. .360; C. temdcorne^ sp. n., Norman, ibid. p. 286, Shetland Islands. 
Ilyperia galha (Montagu) the female, Lestrigonus 'kinaliani (Bate & 
Westw.) fhe young male, ? H. mediisarum (Bate, not Kroyer) the young 
female, ? Lestrigonus exulans (Bate & Westwood) the young male of the 
same species. Norman, Rep. Brit. Assoc, for 1868, p. 286. 
Ilyperia ohlivia (Kroyer) found at the Shetlands, described by Norman, 
ibid. p. 287. 
Metoecus medusarum (Kroyer) also foimd at the Shetlands, Norman, ibid. 
ISOPODA. 
Paranthura costana, A. Dolirn has examined the anatomical 
organization of this animal at Messina ; the vascular system is 
more developed than in most other Crustacea; the heart is 
divided into two parts, one behind the other, the foremost sur- 
rounded by adipose tissue. There are some affinities between 
it and Praniza, but in other respects the Anthuridcs stand 
quite by themselves in the system. Zeitschr. f. wiss. Zool. xx. 
pp. 81-93, pi. ix. 
The development of Asellus aquaticus (L.) (see Record, vol. 
iv. pp. 617, 618) has been studied by Ed. van Beneden. His 
chief results are the following : — The egg, when leaving the 
ovary, is clothed only with one membrane, which is the true 
chorion; the second membrane, mentioned by Sars and Dohrn, 
is the blastodermic cuticle of the embryo itself. The blasto- 
derm is formed by a superficial cleaving of the yolk, in which 
the first segmentations have no result; and each cleaving is fol- 
lowed by an apparent or real coalescence of particles of the yolk. 
The blastodermic cellules are formed on the whole surface, 
before any other organ is formed; but those which form the 
dorsal lamina very easily escape observation. The foliaceous 
