L42 CEYLON PEARL OYSTER REPORT. 



Scalpellum squamuliferum, Weltner (6). 



The adult of this Barnacle is characterised by the possession of two well developed 

 ovigerous lamellae, which are absent from young specimens. They take the form of 

 stout filamentous outgrowths of the integument of the body wall, rounded posteriorly 

 and grooved on their anterior surface. The tip is generally pointed, but may be bifid, 

 and the lamella is often more or less distinctly jointed. The lamellae may be compared 

 as regards relative position and extent with those of Cryptophialus, being situated, 

 one behind the other, on the dorsal aspect of the thorax ; the eggs form a two-layered, 

 coherent mass surrounding the back and sides of the body, and the lamella are 

 imbedded in them. These structures will be figured in the next number of the 

 "Illustrations of the Natural History of the R.I.M.S. Ship ' Investigator,'" 190G. 



I include this species among the forms recorded from the Gulf of Manaar because it 

 is the most abundant deep-sea Lepadid in the Bay of Bengal, and has been taken 

 just outside the Gulf to the north-west. 



? Scalpellum truncatum, Hoek. 



Locality : Gulf of Manaar, 590 fathoms (R.I.M.S. Ship "Investigator"). 



There is a specimen in the " Investigator " collection from the Gulf of Manaar which 

 probably belongs to this species. It differs from Hoek's figure, however, in the 

 following particulars : (1) The carina is relatively longer, and (2) the valves are not 

 so closely knit together. As I have only examined one specimen, and as Hoek has 

 only described the external characters of his single example, I do not feel quite 

 certain of my identification ; but several deep-sea species vary as regards the 

 characters indicated. 



S. truncatum was described from a depth of 1400 fathoms; but several of the 

 Indian members of the genus have a greater range in depth than the identification of 

 the " Investigator" specimen with Hoek's species would imply. It is noteworthy that 

 in the Indian seas the genus is only found at a considerable depth, probably always 

 below 100 fathoms, although in more temperate latitudes it- occurs in 15 fathoms and 

 downwards. It is probably unable to endure warm water, although it is found in 

 every sea. 



Scalpellum tenue, Hoek. 



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



Four .specimens, together with those of S. japonicum recorded above, from the shell 

 of Turbo indicus. My S. subflavwm is very near this species, from which it is most 

 readily distinguished by its smoother shell. 



S. tenue was described from the south of the Indian Ocean. The only other 

 specimen in the Indian Museum is from a depth of 1997 fathoms, in the Bay of 

 Bei igal. 



