421 
in certain points from the animal as described by Philippi; and 
Dr. Allman thought it not impossible that these differences 
would indicate a distinct species, which might be noted under 
the name of C. destructor, as distinguished from the C. tere- 
brans of Philippi. As, however, it is by no means improbable 
that the differences in question are referable to slight inaccu- 
racies in the memoir of the continental zoologist, the proposed 
distinction was considered purely provisional, to be confirmed 
or rejected according as actual comparison of specimens shall 
decide. The following summary of the generic characters of 
Chelurus, more condensed than that given in the memoir of 
Philippi, was proposed by Dr. Allman: 
Cueturus, Philippi. 
Gen. Cha.— Body not compressed; head distinct ; superior 
antenne shorter and more slender than the inferior, and con- 
sisting of a peduncular portion, which supports two unequally 
developed rami.* Inferior antenne large, not divisible into a 
distinct peduncle and ramus. Mandibles strong, palpigerous ; 
furnished with a molar tubercle, with transverse ridges. First 
pair of maxillz strong, pyramidal, palpigerous ; second pair 
lamelliform. Mavillary feet large, bearing a palp-like stem, 
and united at their origin, so as to constitute a great opercular 
lip, covering all the other organs of the mouth. Thorax com- 
posed of seven distinct segments, with the epimere distinct, 
and moderately developed. First two pairs of thoracic legs, 
didactyle ; five remaining pairs terminated by a small, unop- 
* Philippi takes no notice of this character of the superior antennz, and 
simply describes them as setaceous, with seven articulations ; whereas the 
number of articulations, in the animal I have examined, are three in the pe- 
~duneular portion, and six in the larger ramus. I cannot, however, help be- 
lieving that this excellent naturalist has, in the hurry of examination, over- 
looked the real form of these antenne; otherwise I would feel well inclined to 
consider the character in question as affording sufficient grounds to separate 
generically the Irish from the Mediterranean amphipod. 
202 
