Notes from the Gattxj Marine Lahoratory. 549 



tibiae very long. Wings subfuscous ; nervures and tegulte 

 black, the latter large. 



Long. 12 millim. 



Hah. Kashmir, 5000-6000 feet ; fairly common. 



Not very near to any Indian species. 



Tttralonia hrevipenms (Cam.). 



I obtained a number of both sexes of this species from 

 Deesa and Abu ; and as Mr. Cameron's description was 

 evidently taken from a single specimen, I will add a few 

 remarks to it. The pubescence on the thorax of a fresh 

 specimen is rich fulvous in the female, slightly paler in the 

 male. The shortness of the wings is not always so marked 

 as in the specimen figured by Mr. Cameron. In the male 

 the wings do not appear remarkably short ; the antennae are 

 rufous below, and vary from rufous to black above. The 

 nervures vary from pale to dark testaceous in both sexes. 



At Deesa I never found this species except during Sep- 

 tember ; from Abu I obtained it in July and August. As 

 might be expected, the specimens show some seasonal dimor- 

 phism, the Abu specimens obtained during the rain}' season 

 being much darker than those collected at Deesa during the 

 cold weather. 



LXXVI. — Notes from the Gaily Marine Laboratory, St. An- 

 drews.— ^o. XXIV. Bv Prof. M'lxTosH, M.D., LL.D., 

 F.R S., &c. 



1. Ou the Frequency of the Occurrence of Tearls in the Mussel 



{Mytilus edulis), kc. 



2. The Effects of Marine Piscatorial Birds on the Food-Fishes. 



3. On the British Eunicidce. 



1. On the Frequency of the Occurrence of Pearls in the 

 Mussel (Mytilus edulis), S^c. 



The frequency of the occurrence of pearls in the various 

 marine and freshwater shells is fixed by no law. Hundreds 

 of pearl-shells may be examined without finding a single 

 pearl, but, on the other hand, a single Ceylonese shell will 

 occasionally produce a pearl worth a large sum. An ex- 

 perienced pearl-fisherman of the Tay considered that perhaps 

 one in a hundred contained a marketable pearl. In a group 

 of 31 examined lately by Mr. Alex. J. H. Eussejl, M.A., 



