OF THE COSCINODISCEJE. 



837 



Dallastana, Grev TM. viii. p. 115, pi. 4. 

 f. 10. Bermuda, Tripoli. 



A. Wallichianus (Gfrev.). — Areolated 

 compartments, with truncate apices ; 

 mnbilical lines straight. = Asterolampra 

 Widlichiana, Grev TM. viii. p. 115, pi. 4. 

 f. 11. Bermuda, Tripoli. '' Tlie umbilical 

 portion of each ray is so wide next the 

 areolated segments, that it may be com- 

 pared to a short-bladed trowel, while 

 the linear part represents the handle " 

 (Grev.). According to Dr. Greville's 

 figure, this species differs from Astero- 

 lampra only by its median ray being 

 narrower than the rest. 



2 1 Umbilical lines with an angular 

 bend. 



A. Beamnontii (E.). — Compartments 

 with rounded apices ; umbilical lines 

 with an angular bend ; median ones 

 straight, parallel. EB. 1844, p. 200, f. 5 5 

 Grev TM. viii. p. 115. Antarctic Ocean. 



A. Darwinu (E.). — Compartments 

 with rounded or subtruncate apices ; 

 umbilical lines with an angular bend; 

 median ones bent or cm*ved. ERBA, 

 1844, p. 200, f. I. = Asterolampra Uar- 

 winii, Grev TM. viii. p. 116, pi. 4. f. 12, 

 13 ; AsteromphalusRossii, ERBA. p. 200, 

 f. 2; EM. pi. 35 a. 21. f. 4. Antarctic 

 Ocean, Monterey stone, (v. 86.) 



2* Disc suhcircular, rays unequal; um- 

 bilical lines radiating from the top and 

 sides of the median ones, which latter 

 pass beyond and enclose the central 

 point. Spatangidiimi. 



t Umbilical lines not bent. 



A. jiabellatus (Breb., Grev.). — Punc- 

 tated compartments, conic ; umbilical 

 lines straight or slightly curved, radi- 

 ating from apex and sides of the median 

 ones. Grev M J. vii. p. 160, pi. 7. f. 4, 5. = 

 Spatangidiiimjlabellatum, Breb. Bull. Soc. 

 Linn, de Normand. iii. pi. 3. f. 3 ; Aste- 

 rolampra Jlabellata^ GrevTM. viii. p. 116 ; 

 Spatangidiimi peltatuni, Breb. /. c. pi. 3. 

 f. 4. Peruvian and Californian guanos. 

 Rays 10 or 11 ; median one clavate ; 

 areolation of compartments very minute. 



A. Hiltonianus (Grev.). — Punctated 

 compartments naiTowly conic ; umbilical 

 lines radiating from apex and sides of 

 median line's, the two lower pair sud- 

 denly (ii&^es.Q^.= Asterolampra Hiltoni- 

 ana, GrevTM. viii. p. 117, pi. 4. f. 15. 

 Algoa Bay guano, Indian Ocean. Rays 

 10 to 19, slender ; umbilical lines simple 

 or forked ; areolation very minute. It is 



a very transparent species, and easily 

 overlooked, Grev. 



A. Arachne (Breb.). — Disc broadly 

 ovate ; hyaline area small and excentri- 

 cal; areolated compartments, very un- 

 equal ; umbilical lines straight, short j 

 dilated head of median ray truncate. = 

 iSjxitangidium Arachne, Breb. Bull. Soc. 

 Linn, de Normand. iii. pi. 3. f. 1 ; Aste- 

 rolampra Arachne, Grev TM. viii. p. 123 ; 

 Asteromphalus malleus, Wall TM. viii. 

 p. 47, pi. 2. f. 11 ; Excentron cancroides, 

 Ralfs in lit. (v. 66.) Peruvian guano, 

 Indian Ocean. Distinguished by its mal- 

 leiform median ray. Compartments with 

 large areolation ; umbilical lines less con- 

 spicuous than in the other species. Rays 

 usually 5, sometimes 7 ; median and 

 adjacent ones straight, the anterior pair 

 curved. When there are only hve rays, 

 this species differs greatly in appearance 

 from the rest by having the anterior 

 margin of the head of the median ray in 

 direct contact with the anterior com- 

 partment; but when the rays are 7 in 

 number, the hyaline dilated portions of 

 the anterior pair interpose between these 

 parts, as in the other species. 



2 1 Umbilical lines with an angidar 

 bend. 



A. elegans (Grev.). — Punctated com- 

 partments, conic, more than half the 

 radius ; umbilical lines with an angular 

 bend, radiating from apex and sides of 

 the median ones, usually simple, but 

 sometimes two or three united. Grev 

 MJ. vii. p. 7, pi. 7. f. 6. = Asterolampra 

 elegans, MJ. viii. p. 118, pi. 4. f. 16. Ca- 

 lifornian guano, Indian Ocean, (v. 87. ) 

 Areolation extremely minute ; rays 13 to 

 29, gracefully slender. 



A. imbricatiis (Wall.). — Areolated 

 compartments, conic, less than half the 

 radius; rays numerous, robust; angidar 

 bends of umbilical lines forming unitedly 

 an oblong-elliptical figure. Wall TM. 

 viii. p. 46, pi. 2. f. ^. = Asterolampra im- 

 bricata, Grev MJ. viii. p. 119, pi. 4. f. 17. 

 Indian Ocean, Natal. Areolation con- 

 siderably larger than in A. elegans, its 

 nearest ally, Grev. 



A. Brookei (Bail.). — Disc almost cir- 

 cular ; areolation conspicuous ; compart- 

 ments truncated; angular bend of um- 

 bilical Imes near the outer end ; umbilical 

 portion of median ray constricted be- 

 neath the rounded inner end, then dilated. 

 Bail. Sill. Journ. 2 ser. xxii. p. 2, pi. 1. f. 1. 

 = Asterolampra Brookei, Grev MJ. viii. 

 p. 119, pi. 4. f. 18. Soundings, Kamt- 

 schatka, Atlantic, (v. 79.) The uuibi- 



