Observations — 



ON INDO-MALAYAN BARNACLES. 81 



- 



The fact that three species of Alepas, out of the four represented in the Indian 

 Museum collection, prove to be new, while the fourth has only recently been described, 

 probably argues that the genus is considerably more prolific than was hitherto thought. 

 So large a number of species have been diagnosed within the last few years that there can 

 be little doubt that more will be discovered in the Oriental seas when further investigations 

 are made. 



Alepas malaysiana, sp. nov. 



Capitulum distinct from peduncle, laterally compressed, almost triangular, with oc- 

 cludent border convex outwards below opening, covered with a reticulation of fine striae, 

 with deeper wrinkles running at right angles to the main axis of the opening ; no plates ; 

 a distinct but low carinal crest. Opening large, oval, vertical, with tumid, fringed lips 

 continous above but discontinous below. Integument opaque, dirty white. 



Peduncle laterally compressed, irregularly annulated, almost as long as capitulum, 

 of the same width throughout except at the base, where it expands into a flat disk. 



Dimensions — 



Length of Capitulum ... ... 9 mm. 



Breadth of „ ... ... 6.5 „ 



Thickness of ,, ... ... 3.5 



Length of Peduncle ... ... 7 



Appendages, etc. — 



First Cirrus with both rami slender and very short, widely separated from second cirrus. 

 Remaining cirri long and attenuated. Posterior ramus of Fifth Cirrus reduced to a mere 

 thread, less than one- third as long as anterior ramus. Sixth cirrusin much the same condition, 

 but with the posterior ramus relatively even shorter and finer. Anal Appendages slender, 

 rather short, not swollen at the base, with about eight joints. Penis long, slender, 

 indistinctly annulated. 



Mouth-Parts — 



Labruni fairly prominent, simple. Mandible with four teeth, the two innermost quite 

 separate from one another, straight, simple, rather small. 



Observations — 



Unfortunately, owing to its small size and to lack of material, I can give no more 

 than mere a diagnosis of this species. It appears to be closely related to A. lankesterii, 

 Gruvel, from the West Indies, but can be distinguished by its larger opening, carinal 

 crest and opaque integument. Without a more detailed examination it is impossible to 

 say how far the internal characters of the two species agree. 

 Mem. A.S.B. 



