spicua : basi lata, planata, lamellis creberrimis instructa, intus 

 vix undulatis, ad marginėm secundum costas eztemas undatis ; 

 cicatrice musculari Icevi. 

 Long. -48 ; lat. -43 ; alt. -17 poli. 

 Hab. Ad insulas Maris Caribbsei. In Mus. Brit. 

 The species is described from a specimen in my collection, but it 

 exists unnamed in the British Museum. Outside somewhat likę 

 H. Grayanus, but \vith the ribs more crowded, with stronger tuber- 

 cles, and without the scaly and hairy epidermis of that species ; base 

 broad and sharp at both edges, likę H. serratus, but with the lamellae 

 not serrated or separated by epidermis, and with the muscular im- 

 pressiou not corrugated. 



7. HippoNYx (Amalthea) effobiens, n. s. U. t. solidis- 

 sima, depressa, albida viridi tincta ; irregulari, apice subcen- 

 trali, seu vix monstrante ; suleis radiantibus altis, valde distan- 

 tibus, circiter xx. ad xxv. ; basi lata, non planata, intus rotun- 

 data, ItBvi, extus a suleis dentata ; cicatriee musculari longitu- 

 dinaliter tenuissime striata; animali fossam altissimam alio in 

 alio excavante. 

 Long. -52; lat. '47; alt. -13 poli. 



Hab. Ad insulas Maris Caribbsei, In Mus. Brit. et Mus. Cuming 

 repertura est. 



Shell small, but enormously thick, and deeply cut by the few 

 radiating furrows. Base rounded, toothed outside. Very deep ex- 

 cavations are made in the shells by yomiger specimens. Specimens 

 much larger than those described are in Mr. M'Andrew's collection. 



4. EXTRACT FROM A LeTTER ADDRESSED TO AdAM WhITE, EsQ. 



BY Major Thomas Htjtton, — dated Mussoree, Nov. 27, 1855. 



" In a box despatched from this to Calcutta on the 22nd inst., I 

 enclosed a small packet for you containing liATug cocoons of Actias 

 selene, in order that you may have an opportunity, if they surrive 

 the trip, of witnessing'the mode in which the moth effects its escape, 

 as I think the proceeding will be interesting to you and to entomo- 

 logists generally. I have added two Cocoons in which the pupa is 

 dead, in order to show you how distinctly visible are the wing spines, 

 which formerly induced me to re-iiame the genus as ' Plectropteron,' 

 a term which I still think more applicable than Actias, in which the 

 generic characters make no mention of the spine. As this instru- 

 ment exists in both the species found in India, you will probably 

 also detect it in A. lana, of America : and whether the generic name 

 be changed or not, the characters mušt be revised. Before pro- 

 ceeding to separate the threads by the wing spines, I have ascer- 

 taincd that the Moth ejects from the mouth a few drops of a clear 

 colourless fluid, with which the gum is dissolved, and it apjiears to 

 use the tuft of down on the front, betwcen the eyes, as a brush for 

 the appUcation of the solvcnt. This is a curious fact, as the genus. 



