24 Transactions of the South African Philosophical Society. 



inclosed in the mantle. They have no mandibles. The rhachis of 

 the tongue is naked ; the pleurae wear a very strong, particularly 

 formed lateral plate and sometimes also (1-6) outer plates. They 

 have a particular masticatory stomach with three very strong calcined 

 plates. Their unarmed, peculiarly formed penis is provided with a 

 well-developed prostatic apparatus. 



1. Philine aperta (L.). 



Bulla aperta, L., Syst. Nat., ed. xii., 1767, p. 1183 ; ed. xiii. 



(Gmelin), t. i., pars vi., 1791, p. 3424. 

 Philine quadripartita, Asc. I.e., 1772, p. 329, tab. x., figs, a, b. 

 Bulla Schroeteri, Phil. En. moll. Sic, ii., 1844, p. 94, tab. xx., 



fig. 2. 

 Bulla Schroeteri, Ph. Krauss, Die siidafrikan. Moll., 1878, p. 70. 

 Philine quadripartita, (Asc.) R. Bergh. Malac. Unters. v. 1900, 



pp. 276-285, taf. xxiii., figs. 15-35; taf. xxiv., figs. 2-5; 



taf. xxvi., figs. 1-9. 



PI. V., figs. 5-10. 



More than twenty large specimens were procured by dredge off 

 Elsie Peak (False Bay) from a depth of 10 fms. on sand and shell 

 bottom ; several also near Roman Rock (False Bay) by shrimp-trawl 

 on fine sand from a depth of 13-18 fms., and in False Bay, and off 

 Cape Natal and Umvote River. 



The first-mentioned had a length of 5*5-6 cm. by a breadth of 

 3*5-3*3 and 4, and a height of 1-1*5 and 2 cm. ; the length of the 

 piece behind the foot was 1*8-2 cm. The animals were coloured 

 white. 



The shell was 2*8 cm. long by a breadth of 2*5, and a height of 

 1*5 cm. ; white, rather solid. 



The form of the animal quite as usual. The tentacular (frontal) 

 shield and the mantle shield nearly of the same length. The flat 

 rounded-hexagonal tentacular shield with its slightly prominent 

 margin mostly covering the neck, and sometimes also the anterior 

 margin of the mantle shield. The anterior margin a little notched 

 in the middle, and on each side of it a fine pore ; next to the furrow 

 between the shield and the foot the yellowish, slightly prominent 

 rhinophore about 1 cm. long, with about fifteen low folds. The 

 'mantle shield somewhat convex, rather posteriorly and somewhat to 

 the left sometimes (in the two larger individuals and three smaller), 

 a fine opening leading to the shell. The hinder margin of the 

 mantle prominent beyond the shell, notched medianly, and passing 

 in the rather flat and broad covering of the left part of the shell and 



