113 Rev. A. M. Norman on a new Echinoderm from Ireland. 



necnon inter saxa ad basin ascensus "las Vueltas" dicti (" Breiia 

 alta") inter Villam S™ Crucem et "La Banda" Ins. Palmse. 



Compared with its very near ally H. aspersa, Miill., which is, 

 in fact, exactly intermediate between itself and H. Mazzullii,Ja.n, 

 H. spumosa has a notably smaller and more depressed spire, 

 only equalling one-third instead of nearly one-half of the whole 

 height; the last volution has its transverse diameter much 

 greater in proportion to its height, rendering the shell trans- 

 versely oblong rather than globose, and the aperture more pro- 

 duced obliquely downwards anteriorly, or oval instead of rounded 

 or circular. Lastly, the suture descends gradually instead of 

 being abruptly deliexed anteriorly. But however difficult to 

 distinguish from H. aspersa, Miill., by the shell alone, I am 

 inclined to consider it a really distinct species, because, in addi- 

 tion to these characters of the shell, and the remote and isolated 

 habitat, the animal has the singular property of throwing out, 

 when captured, a quantity of mucous froth or bubbles, so as to 

 become presently entirely enveloped in a mass of foam. 



In further confirmation of this view, it should be noted that 

 the true H. aspersa, Miill., occurs in no other island of the Ca- 

 narian or Madeiran group, though within the last ten or fifteen 

 years it has been introduced by some inconsiderate person into 

 a garden at Eunchal. Nor did I meet with it on the opposite 

 coast of Africa at Mogador. 



Lea Rectory, Jan. 15, 186L 



XV. — On an Echinoderm neiv to Science, from Ireland. 

 By the Rev. Alfred Merle Norman, M.A. 



[Plate IX. figs. 1-4.] 



ECHINODERMATA. Fam. PriapulacidsB. 



Genus Strephenterus *, n. g. 



Forma cylindrica, antice truucata, infuadibuliforniis, sine tenta- 



culis, postice subito acuminata, tentaculisque ornata. Intestiuum 



longissimuni multumque convolutum, maximam corporis partem 



penetrans, inde rediens per anum hand longe ab ore situm se 



effundit. 



Echinoderm naked, cylindrical; mouth funnel shaped, un- 

 provided with appendages ; the posterior extremity ending in a 

 point, and furnished with tentacular appendages. The intestine 

 is very long, and descends in a spiral coil through at least two- 

 thirds of the entire length of the animal ; it is then reflected, 

 and, returning to the fore part of the body, has its anal orifice 

 situated not far from the anterior extremity. 



* aTp((f)(tv, to turn ; evrepov, the intestine. 



