PROLECANITKS C0:\I1'RESSUS. 2U5 



iiiiiiKM] " (limiiililrs iVisciis " by ]\I'Ci)y, and Hguix'd in the " Syiio[isis," pi. ii, tig. (i, in 

 wliicli, like- some other figure.s in the plates of that work, it lias been rever.sed by 

 the lithograjdier, who ha.s also left out the rock in which it is partly embedded. In 

 the figure of tlie suture-line given by M'Coy (loe. eit.) it is represented as having a 

 divided first lateral lobe, but a careful examination of the specimen shows that such 

 is not the case, but that the first lateral lobe terminates in a single point ; and 

 further, that the pcrij)lieral lobe is not V-shaped, as M'Coy represents it to be, but 

 is shaped somewhat like the lateral lobes, being slightly contracted above, expanded 

 below, and terminating in a rather acute point.' 



I may here supply an omission in the diagnosis of the species, and that is 

 that in the adult shell a very conspicuous rim or keel is present at the angles 

 of the periphery on each side. I would fui'ther mention the oceui-rence of 

 " epidermids," seen on the concave impressed zone of the antipcripheral area of the 

 large specnnen figureil on PL XL VIII, fig. 4 a (here I'educed to aljout one-half of 

 the natural size), on a part of the body-chamber which, owing to a fracture, can 

 be detached from the specimen. These epidermids consist of short, rather coarse, 

 interrupted, transverse, impressed, wavy lines, which become finer and more pit-like 

 at the ridges bounding the area referred to. The condition of the fossil is such 

 that they cannot be definitely made out on the sides of the body-chamber ; Ijut on 

 the periphery, near its subangular margin, their punctate character can l;e distinctly 

 seen. 



The features of this interesting species are, I think, well displayed u})on the 

 plate, and my only regret is that, owing to ^\^aiit of space, I was obliged to represent 

 fig. 4 a one-half its natural size. Fig. 7 is the suture-line of a specimen from the 

 Isle of Man, and is intended to show the peripheral lobe which is not })reserved in 

 the Cork specimen (4c). The figures of the suture-lines are drawn full size. 



The largest specimen kno\vn to me is a fragment which I obtained at Little 

 Island, near Cork ; it is now in the ^Museum of Science and Art, Dublin; it has 

 become elliptical by pressure, the longest diameter measuring about 200 nun.; other 

 measurements would be scarcely trustworthy owing to the great distortion of this 

 specimen. A somewhat smaller individual from the same locality, with more nearly 

 normal proportions, has a height of body-whorl of 50 mm. at a ])osition probably not 

 far from the aperture. 



Lnralllies. — Cork (city); Jiittle Island, Blackrock, and Midleton, near tin- city 

 of Cork; Ballynabointra, county of Cork (East Riding); "Foui' iniles east of 

 Loughrea," county of Gal way. 



' 'Geol. Mag.," dec. 4, vol. i, Jan., 18!U, p. 11 : "On tlic Iclcnlity of Elli/tnolitcK coiiqjniyi<ui!, J. 

 Soworliv, with Aiiimoiiitcn IlenKl'/wi, J. Sowerhv ; '' 1)V A. H. 1''imiii1 ;uk1 (j. C Crick. 



