BRITISH ASSOCIATION. 251 



observations have confirmed this. But in the species to which I now refer 

 there is an important exception. Lest there should he any error on the 

 matter, I have during the past summer (1857) again investigated the 

 point, and have bred many thousands in confinement, and under the 

 microscope have seen them escaping. So that there can in my own 

 mind be but little doubt on the matter. 



The young of Palinurus vulgaris differ from every other species with 

 which I am acquainted. On escaping ex ovo, the different parts are very 

 obscure, being very closely folded together ; but in a few minutes they 

 spread out sufficiently to become recognisable under a very moderate 

 magnifying power. The carapace is globular, oval, slightly pointed or 

 produced both at the anterior and posterior margin, and also slightly 

 contracted anteriorly, so as to give the appearance of a rostrum. The 

 abdomen is moderately long, and from four of the six annulations of 

 which it is composed arise eight pairs of tendril-like appendages. The 

 lateral margin of each ring is expanded into a thin, projecting process, 

 from which the articulated appendages arise. These tendrils are long, 

 slender, and dichotomous. Their double character commences at the 

 third joint; for the remainder of their length they are nearly equal, and 

 are covered with strongly marked spines ; their termination is pointed. 

 The caudal extremity is simple, contracted, pointed, and somewhat oval; 

 on the centre of the rostrum is a dark spot ; the eyes are placed on 

 enormously long and stoutly club-shaped peduncles, which are attached 

 by very narrow and slender points. The pedunculated eyes are about 

 two-thirds as long as the carapace. 



This concise description, with the figures accompanying it, will suf- 

 ficiently explain the great differences between this and the young of all 

 other species hitherto described. 



So general is the Zoe form, that it has even passed into an expres- 

 sion with investigators of this branch of Natural History ; and " the Zoe 

 condition" has been considered equivalent to "the embryo state" in 

 speaking of these creatures. 



The contrast between that of the present species and others is very 

 great. In them, the eyes are sessile ; in this, enormously pedunculated. 

 In them the limbs are beneath the carapace ; in this they are attached 

 to what, for clearness, I have called the abdominal rings. 



Instead, therefore, of belonging to the genus Zoe, this would be 

 placed in Phyllosoim of Milne-Edwards, as belonging to the Stomapodes. 



ON A SECTION ACROSS SLIEVENAMUCK, COUNTY OF TIPPERARY.* 

 BY JOHN O' KELLY, ESQ. 



The Slievenamuck range is separated from the Galtees by the vale of 

 Aherlow. It commences about ten miles south-west of the town of Tip- 



* Read before Section C at the Meeting of the British Association, Dublin, August 26, 



1857. 



