210 REPORT ON ZOOLOGY, MDCCCXLII1. 



ff/daris (L. quadrangularis, Miill.) ; and a new species, A. reticnlata. (7) 

 Pleuroxus : anterior margin prominent on the upper portion ; the lower part 

 truncated, or cut off straight, first pair of feet very large : PL trigonettw 

 (L. triff., Miill.), and PL liamalus (L. ham., Baird.) (8) Peracantha : oval, 

 the lower extremity of the shell slightly curved backwards, and, as well as 

 the upper extremity of the anterior margin, beset with strong, hooked 

 sprues : P. truncata (L. truncata, Miill.) 



OSTRACODA. A Cypris was brought by Dieffeubach from New Zealand 

 (Travels, ii, p. 268), and has becu described by Baird: C. novte Zelandite ; 

 egg-shaped, elongated, equally rounded at each end, somewhat inflated 

 and with a shallow sinus in the middle of the anterior margin, smooth, 

 shining, entirely without hairs ; resembling C. dctecta, Miill., in which, how- 

 ever, the shell is not inflated. 



COPEPODA. Philippi (Archiv. 1S43, i, p. 54) has communicated his 

 further observations on the Copepoda of the Mediterranean. A memoir, of 

 importance in the systematic arrangement of the order. Seven new genera 

 are instituted: Euchceta, Idya, Metis, ^Enippe, Onccea, Enryte, Idomene, each 

 with a new species. Cydopsina, Edw., is limited by the author to C. castor, 

 and C. staphylitms and furcatus are referred to Naupli'us, of which genus he 

 mentions 14 species. 



Goodsir (Edinb. New Philosoph. Journ. vol. xxxv, p. 336, pi. 6) has 

 described a new species of Cetocldlus, differing from C. australis in having 

 two long spines on the twenty-second and twenty-third joints of the external 

 antenna;, and also in the form of the foot-jaws, and which the author calls 

 C. septentrionalis ; besides this (ib. p. 337) a new genus, IroKfws, with the 

 following characters : a large tubular organ arising from the abdominal 

 surface of the body, bears at the apex the visual organs ; the right antennae 

 much swollen a little behind the middle ; 10 jaw-feet. The species /. splen- 

 d'ulus is remarkable from the metallic brilliancy of the colours, in which 

 sappharine and emerald predominate. Both are found in the "Maidre" (vid. 

 supra), in the Firth of Forth, the latter solitary, the Ccioclnlus in masses. 



SipnoNOSTOMA Important and more precise investigations on some species 

 belonging to the North Sea have been instituted by Rathke (Yerhandl. d. Kais. 

 Leop. Akad.xii, p. 98.) The species observed wcre,Cal/f/us curtiis, C. diaphanus, 

 Nordm., C. /lippot/losst, Kroy., Nicothoe Astaci., Avid., Chondracanthus 

 Lop/iii (g'Mosus, Kroy), Lernaia bracliialis, L. The internal structure of 

 Callfjus curtus, Nicothoe Astaci. Chondracanthvs Lophii, Lerncea brachialis, has 

 been investigated. Especially important are the observations on the develop- 

 ment of Nicothoe Astaci ; for in this species no metamorphosis takes place, 

 as is elsewhere the case in this order, but the young leave the egg in a form 

 similar to that which is presented by the adidt animals. Only the large 

 wing-shaped processes of the cephalo-thorax of the female are wanting; 

 these contain the sexual organs, and are consequently developed at a later 



