792 General Notes. [August, 
by Willemoes-Suhm.’ In the females, however, the palpus is 
small and unarmed, and it is probable that all my specimens of 
Palzotypus are females, since most of them have breeding lamel- 
læ. In the figure of Gampsonyx referred to, the thoracic legs 
themselves, irrespective of the breeding lamella, are represented 
as biramous, and the two rami are drawn as of nearly equal 
length; it is probable that there has been a mistake in drawing 
the legs, as in none of the existing schizopods, such as Mysis and 
allies, Euphausia, Gnathophausia, Petalopthalmus or Chalaraspis, 
are the legs thus thrice divided. It is to be hoped that the fossil 
itself will be examined anew with regard to this important point. 
It is sufficiently evident, however, that Gampsonyx and Palzo- 
caris are closely allied forms, and as suggested by Messrs. Meek 
and Worthen, should fall into the same family, which may be called 
Gampsonychide. The principal character which separates this 
group from all other schizopods is the entire absence of a carapace. 
t is worthy of notice, however, that the size of the carapace is 
very variable in the Schizopoda, and in the genus Petalophthal- 
mus there is a great discrepancy in the two sexes; in the female 
it covers the entire thorax, while in the male it is remarkably 
small, subtriangular, leaving the two hinder thoracic segments 
entirely exposed, as well as the sides of the two segments in 
front. In the large size and oval-lanceolate shape of the breed- 
ing lamellz, both of the gnathopods (maxillipedes) and thoracic 
feet, the Gampsonychidz agree with Petalophthalmus, in which 
they are large and broad. In the shape of the telson and the 
comparative size and proportions of the last pair of abdominal 
appendages there is a close relationship in the Gampsonychide 
to the schizopod genera Petalophthalmus and Chalaraspis, espe- 
cially the latter genus, in which the telson is rounded at the end, 
while the two rami are more as in Petalophthalmus, though 
broader. The other biramous abdominal appendages in the 
Gampsonychidz are truly schizopodal. 
Classifying the Schizopoda by the carapace, there would seem 
to be three groups, as follows: 
1. Carapace aoe sany a 
Il. ree, varying in size.. G fa. , Chalaraspis. 
Tit, yes T to A, Sea Soa “Whee, Lagat, Cephanoia. 
But I should agree with Willemoes-Suhm that this is not a 
natural genealogical classification, and throwing out the Nebalia- 
dz, which we have endeavored to show belong to a distinct order 
of Crustacea, the families of schizopods may be enumerated 
thus, all having seven abdominal segments : 
carapace ab 6 pairs-of thoracic legs... sser sse sses sess.. I. Gampsonychida. 
evelop A aeai of thoracic legs, i. 
i. Myside. _ 
1I Euphausiide. 
= i mid s c e mo IV Chalaraspide. 
a e p“ - 4 e ‘ a Vv. Lophogastrid@. 
_ TOn some Atlantic Crustacea from the Chall iti By Dr. R. vor 
ae Some Atlantic A ; enger expedition. By Dr. KN. 
s-Suhm. Linnæan Transactions. Zodlogy. Vol. 1, p. 23, 1874- 
