tinctus, castaneo bifasciatus, punctis et lineis interrupts cinctus 

 (Plate I. f. 2). — The interrupted lines are coincident in downward 

 flashes, and united by two chestnut bands ; coronal tubercles 

 large. 



2. fuscatus, Hon/. — C. C. inijieriall similis, sed ilamniis cas- 

 taneis longitudinalibus magnis ornatus (f. 3). — In this species 

 the downward Hashes are large, dark, and defined, while the inter- 

 rupted cross-lines are less prominent. 



3. vikidulus, Lawk. — C. C. imperiali similis sed brevior, 

 flammis longitudinalibus subviridibus angustatis (f. 1).— Rather 

 shorter than the two preceding, with the downward flashes narrow 

 and greenish. 



4. MAiiMOREUS, Linn. — C. oblongus, tuberculis magnis coro- 

 natus, medio subcontracts, albus, roseo tinctus ; lineis nigrescen- 

 tibus semicircularibus pictus, interstitiis cordiformibus (f. 5). — 

 The ground is tinged with rose-colour, and the whole surface is 

 reticulated with semicircular lines, leaving heart-shaped interstices. 



5. Handanus, Brug. — C. C. marmoreo similis, sed maculis tri- 

 gonis castaneis reticulatus, medio leviter bifasciatus (f. 8). — The 

 shell is generally straighter, and the chestnut markings broader, 

 particularly in two central zones. Probably only a variety of C. 

 marnwreus. 



6. NocrmtNUS, Bng. — C. C. marmoreo similis, sed colore ni- 

 grescenti pictus, interstitiis cordiformibus, albis, paucis (f. 4). — 

 Probably another var. of C. ma/rmoreus, in which the dark colour- 

 ing nearly covers the shell. 



7. l>i:i(iji!<;!iLE, Sowb. — C. subventricosus, versus basin angus- 

 tatus, nodulis eontractis coronatus, albus, roseo tinctus, fasciis latis 

 duabus castaneis et lineis cordiformibus pictus; variat granulatus 

 (f. G, 7). — Coloured like C. nocturnus, and usually considered as 

 a variety, but it is bottle-shaped, and the crowning nodules are 

 contracted into rounded nipples. The smooth variety (f. 7) is in 

 the collection of Mrs. Deburgh, who first remarked it as a distinct 

 species. 



8. vidua, Reeve. — C. quam C. marnwreus brevior, ad angu- 

 lum rotundatus, ad basin contractus; fusco angulatim minute 

 reticulatus (f. 9, 10). — Shorter and more contracted at the base 

 than C. marnwreus, with the angular reticulations more numerous 

 and line. 



i). Nicobauicus, Brui/.- — C. oblongus, lateribus rcctis; spira 



DS 



