CIRRIPEDIA. 



141 



delicate species and D. pellucida is one of the most delicate depends to some extent 

 on the state of preservation of the specimen examined. 



D. pellucida has only been found on sea-snakes. It occurs most commonly, in 

 Indian seas, on Hydrus platurus ; but I have seen it on more than one species 

 of Distira. 



Poecilasma kaempferi, DARWIN (1). 



The Ceylonese specimens (from 430 fathoms in the Gulf of Manaar) I have 

 examined belong to the typical form of the species, which is probably circumtropical. 

 It is found attached to various prawns. 



y 



Scalpellum gruvelii, ANNANDALE (15). 



I give an outline of the valves of this species (fig. 4). It is one of the larger 

 members of the section of its genus with imperfectly calcified 

 valves, the figure being twice natural size. In the variety 

 quadratum, also from the Gulf of Manaar, the carina is much 

 more strongly bowed, and in the typical form the preumbinal 

 portion of the carina is often relatively more extensive. The 

 section to which this species belongs merges gradually into 

 that with fully calcified valves, but the division is convenient 

 for the sake of reference. In S. gruvelii, as in S. alcockianum, 

 S. laccadivicum, and S. japonicum, the plates are actually 

 imbedded in membrane, and traces of the imperfectly calcified 

 parts which are not fully formed can be detected. In S. inerme* 

 from near Java, on the other hand, not only are the valves 

 very much stouter, despite the shape of the tergum, but they 

 are lightly attached to the inner surface of the membrane and Fig. 4. Scalpellum gruvelii, 

 their outlines are quite sharp. ANNANDALE. x 2. 



S. gruvelii is only found at great depths, at which it is not uncommon in the 

 Indian seas. 



Scalpellum japonicum, HOBK (3). 



Locality : Gulf of Manaar, 595 to 556 fathoms (R.I.M.S. Ship "Investigator"). 



Col. ALCOCK has recently called my attention to certain Barnacles attached to living 

 shells of Turbo indicus from the above locality. Two of them agree with HOEK'S 

 description and figures of S. japonicum from Japanese seas. S. laccadivicum, which 

 will also be found (in all probability) in the Gulf of Manaar, is related to this 

 form, but has the valves less imperfectly calcified, especially in the variety 

 investigatoris. 



* I understand that HOEK regards this form as a variety of S. stearnsii, PILSBUIIY ; but his paper, read 

 before the Koyal Academy of Sciences of Amsterdam in January, has not yet reached Calcutta. April 

 30, 1906. 



