406 REPORT ON ZOOLOGY, MDCCCXLIV. 



of the segments and limbs. He agrees with Ericbsou in tliinking that the 

 conical process in front, iisually called the head, is only a part of it, which 

 he names snout (schnabcl) ; the next piece, (according to Erichsou the head), 

 appears to him to include also the first of the thoracic segments (four in 

 number), with its pair of legs (the third pair of jaws, according to Erichson). 

 The anterior portion of this piece usually more or less defined by an im- 

 pression, he considers as the proper head, or the ocular segment (augen- 

 ring). It bears three pairs of appendages (jaws); the third pair being the 

 egg-bearing feet, not confined to the ? exclusively, as has been assumed, 

 for lie has found them in both sexes of Nymplion, Zetes, and Pallene. Of 

 these three pairs one or two frequently are wanting ; and sometimes even 

 the third pair disappears, but this in the < only. "With respect to the 

 systematical position of the family, he is of opinion that our acquaintance 

 with the various forms of these marine animals and with their internal 

 anatomy, is too imperfect as yet to authorize any positive conclusion. He 

 is disposed, however, provisionally to unite them with the Crustacea, as 

 Johnston and Milne Edwards have done, rather than with the Arachnida, 

 according to the views of Erichson.] 



Goodsir (Ann. Nat. Hist, xiv, 1, pi. 1) has illustrated the differences as 

 to the form, position, and direction, of the eye-bearing tubercles in various 

 species of tliis family, Pycnoyonum, Phoxichilus, Phoxichilidiiim coccineum, 

 Pallene circularis, Pasithoe vesiculosa, Nymplion johnstoni, spinosum, pelluci- 

 dum, simile (new species). In some of these the number of joints of the 

 palps and the form of the claws also is given. 



CRUSTACEA. 



Zaddacli has given a synopsis of the Crustacea of a Prussia, in an occa- 

 sional essay of great merit, Synopseos Crustaceorum Prussicorum Prodro- 

 mus. Regiom. 1844 ; in which many of the species, in particular the new- 

 discoveries, are illustrated by descriptions in detail. 



Milne Edwards and Lucas have examined the Crustacea collected by 

 D'Orbigny in South America. (Voyage dans PAmerique meridionale.) All 

 the species enumerated are from the coasts of Chili and Peru, with the single 

 exception of Leucippe ensenadee, a new species, from the coast of Patagonia. 

 As I intend soon to give, in these Archives, a general view of the Crustacea 

 of the same coasts, which will of course comprise the new genera and species 

 characterized, it is ueeedless to discuss them particularly in this place. 

 The article on Crustacea in the work under review is confined to the 

 Decapoda. 



Goodsir (Ed. N. Phil. Journ. xxxvi, 183 ; Froriep N. Notiz. xxix, 161) 



