3IO JOURNAL OF CONCHOLOGY, VOL. 11, NO. ID, APRIL, I906. 



makes the lateral expansions conspicuous. The teeth are attached to 

 the lingual ribbon by ligaments at their bases. On the tip uf each 

 are two notches, one wider and rounder than the other, which 

 form three small denticulations. Some of the smaller teeth in the 

 heap show a striation like that of Lophoceniis, but much stronger. It 

 is not, however, visible in the teeth which are in the row. The 

 salivary glands are grape-like clusters of simple or compound ovate 

 bodies. The oesophagus is very thin. On it rises a large diverti- 

 culum, much as in Lop/ioce9xus, 5 mm. high and studded with simple 

 and compound knobs. 



The female orifice is just inside the mantle cavity. Behind it can be 

 seen clearly the mucous gland and two spherical spermathecse, one 

 larger than the other. The penis is in a bag, hanging freely on the 

 inner side of the body wall under the right rhinophore. The slender 

 vas deferens is free as it enters the bag, but further back is attached 

 to the body wail. The penis is flattish, curved and tapering. The 

 duct can be clearly seen traversmg it to the very tip, and the whole 

 organ is divided by transverse striations into a series of segments. 

 This conformation seemed quite clear in all the specimens, but is not 

 indicated in Bergh's figures of Lohiger philippii {l.c.^ pi. 13, figs. 36, 37). 



BULLACEA. 



These forms have mostly been treated conchologically. The most 

 important information as to the anatomy and systematic morphology 

 is given by Bergh.^ The more typical BuUids seem to fall into the 

 two genera Bulla and Harnincea, of which the former has no perios- 

 tracum on the shell, small parapodia and a narrow radula with the 

 formula i. 2. i. 2. i., while Hamhiaa has the shell covered with a 

 periostracum, larger parapodia, and a wider radula, with a formula 

 varying from 50. i. 50 to 8. i. 8. The shape of the stomach plates is 

 also somewhat different in the two genera. Aplustrum {=Hydatma) 

 though sometimes confounded with these genera differs widely in the 

 male genitalia and digestive organs. The species described below 

 seems referable to Harnincea. 



Haminaea simillima. (PI. V., fig. 8). 



Pease, Ajner. Journ. Conch. ^ vol. 4, p. 72, pi. 7, fig. 3, and pi. 12, 

 fig. 21. 



Two specimens found on seaweed at half-tide on Prison Island, 

 Zanzibar. When alive they were about 15 mm. long, and 5 mm. 

 across the shell. The head and body were well extended, but the 

 shell was not nearly covered. The ground colour of the body is 

 described as having been light green and white, with numerous distinct 



I " Malacologische Untersuchungen," Sempey's Reisen, VII., iv., 3, page 209^ 



