COETNELLA.— MTEMECIUM. 183 



CoEYNELLA sociALis, UhuU. (Plate XXXIV. figs. 11, 11 a.) 

 1882. Corynella socialis, Hinde, Aun. & Mag. Nat. Hist. ser. 5, vol. x. p. 197, t. 10. f. 3. 



Sponge compound, consisting of three or more individuals growing from a common 

 cylindrical stem. The base is either widely expanded or contracted to a blunt point ; 

 the summits are wide, and obliquely truncate. The outer surface uneven, with short 

 blunted projections. The type specimen is 49 mm. in height and 4-3 mm. in its 

 greatest width. 



The apertures of the outer surface are irregular in form. The fibres, as seen in a 

 transparent section, are from '12 to '2 mm. in thickness. The spicular structure 

 resembles that of the last species. 



Distribution. Upper Green Sand : Warminster, Wiltshire {coll. Baker). 



Corynella multidigitata, Mich. sp. 



1840— i7. Spongia multidigitata, Mich, sp., Icon. Zooph. p. 217, t. 51. f. 9 a, b. 

 1878. Peronella multidigitata, Zitt. Studien, III Ab. p. 33, t. 12. f. 3 ; idem, Neues Jahr- 

 buch, 1879, p. 25, t. 2. f. 3. 



Sponges growing in relatively large bushy masses, in one example 79 mm. in height 

 by 83mm. in width; consisting of cylindrical tubes from 7 to 10 ram. in width, 

 frequently coalescing laterally. The cloacal aperture is 2 mm. in width. The 

 outer surface exhibits only the irregular apertures between the fibres. No canals 

 are present. 



The fibres, as seen in a transparent section of a specimen from Le Mans, are from 

 •14 to -2 mm. in width, and are composed of filiform three-rayed spicules, with 

 slightly developed basal rays similar to those of the preceding species. The length 

 of the lateral rays is about "OS mm. 



Distribution. Upper Green Sand : Le Mans, Sarthe. 



Genus MYRMECIUM, Goldf. 1826. 



Myrmecium'? hieroglypha, Klipst. sp. 



1843. Scyphia hieroglypha, Klipst. Beitr. z. g. Kennt. d. ost. Alpen, p. 284, t. 19. f. 6 a, b. 

 1864. Epitheles hieroglypha, Laube, Denks. d. k. Akad. d. Wiss. Bd. 24, p. 236, t. 1. 



f. 17 a, b. 

 1878. Scyphia hieroglypha, Quenst. Petref. Bd. 5, p. 549, t. 140. f. 52. 



Distribution. Trias : St. Cassian, Tyrol {coll. Klipstein). 



Myrmecium hemisphericum, Goldf. 



1826-33. Myrmecium hemisphericum, Goldf. Petref. 1 Th. p. 18, t. 6. f. 12. 

 1826-33. Cnemidium rotula, Goldf. ib. p. 16, t. 6. f. 6. 



