114 Rev. A. M. Norman on the Discovery 



In the specimen described, the cloaca has been torn away from 

 the anal opening by muscular contraction in death, and is lying 

 in the body. A short distance above, is seen an opening in the 

 integument (fig. 4), from whence the cloaca would appear to 

 have been torn. 



The total length of the expanded Echinoderm is 1^ inch, the 

 breadth | inch. 



Strephenter-us claviger was taken in the autumn of 1858 in 

 Bantry Bay. 



EXPLANATION OF PLATE IX. figs. 1-4. 



Fig. 1. Strephenterus claviger (Norman), slightly enlarged. 



Fig. 2. A tentacle-head magnified, showing, a, the opening into the interior; 

 b and c, supplemental processes. 



Fig. 3. Another tentacle-head magnified, in which the pear-shaped bodies 

 {d, e,f) are seen within the investing membrane. 



Fig. 4. Internal organs of fore part of body : g, inner tunic ; h, the funnel- 

 formed mouth ; i, the oesophagus ; k, the cloaca of the intestine, 

 which has been torn away from the anal aperture, I. 

 Sedgefield, co. Durham, Dec. 31, 1860. 



XVI. — On the Discovery o/Physa acuta {Drap.) in England. 



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



[Plate IX. figs. 5-9.] 



Physa acuta (Draparnaud). 



Physa acuta, Drap. Moll. T. et F. France, p. 55, pi. 3. f. 10, 11 ; Brard, 

 Coq. Envir. Paris, p. 169, pi. 7- f. 5, 6; Brown, lUus. L. and F. 

 Conch. Great Britain, pi. 3. f. 9, 10 (copied from Drap.). ; Moquin- 

 Tandon, Hist. Nat. Moll. T. et F. France, vol. ii. p. 452, pi. 32. f. 14- 

 23, and pi, 33. f. 1-10 ; Michaud, Comp. Drap. Moll. France, pi. 16. 

 f. 19, 20.* 



iBulla rivalis. Mat. and Rack. Trans. Linn. Soc. vol. viii. p. 126, pi. 4. f. 2 ; 

 Mont. Test. Brit. Supp. p. 97. 



IPhysa rivalis, Turton, Man. L. and F. Shells, p. 128. f. 112 (copied from 

 Mat. and Rack.). 



Animal pinkish ash-colour, thickly sprinkled on all parts of 

 the upper surface with black specks, those on the head being 

 largest. Head bilobed in front and slightly expanded. Ten- 

 tacles a little thickened towards their apices, and remarkable for 

 having a black central line. Foot short, only reaching to the 

 suture that divides the second from the third whorl, neither 

 carinated nor acutely pointed behind. Mantle-edge bounded by 

 the margins of the aperture of the shell, and not at all reflected 



* The references given are only to those works that I have had an 

 opportunity of consulting. For additional synonyms see Moquin-Tandon 

 and ' The British Mollusca,' vol. iv. p. 146. 



