PEEONELLA. 165 



absence of canals in the Pharetrones is but of secondary importance in comparison 

 with the fibrous structure, this species will require to be placed under Corynella. 



Peronella subc^spitosa, Munst. sp. 



1841. Scyphia subccespitosa, Miinst. Beitr. iv. p. 28, t. 1. f. 14. 

 1878. Peronella subccespitosa, Zitt. Studien, III Ab. p. 32. 



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



Peronella cymosa, Lamx. sp. 



1821. Spongia cymosa, Lamx. Exp. method, p. 88, t. 84. f. 7. 

 1840-47. Scyphia cymosa, Mich. Icon. Zooph. p. 249, t. 58. f. 3 a, b. 

 1854. Spongia cymosa, Morris, Cat. Brit. Foss. p. 30. 

 1878. Peronella cymosa, Zitt. Studien, III Ab. p. 32. 



The only example of this species in the Museum is a small bushy mass, 69 mm. in 

 width by 40 in height, composed of radiating and occasionally bifurcating cylindrical 

 stems, about 8 mm. in diameter. The stems are either single or amalgamated laterally. 

 The cloacal aperture is circular, about 1'5 mm. in diameter. The anastomosing fibres 

 are about '\o mm. in thickness. I have not been able to ascertain the spicular 

 structure. 



Distribution. Middle Jura: Couche a Polypiers — Ranville, near Caen. Great 

 Oolite : Hampton Cliff, Bath {Morris). 



• Peronella pistilliformis, Lamx. sp. (Plate XXXIII. figs. ], la.) 



1821. Spongia pistilliformis, Lamx. Exp. method, j). 88, t. 84. f. 6. 

 1840-47. Scyphia pistilliformis, Mich. Icon. Zooph. p. 250, t. 58. £. 4 a, b. 

 1854. Scyphia pistilliformis , Morris, Cat. Brit. Foss. p. 29. 

 1878. Peronella pistilliformis, Zitt. Studien, III Ab. p. 32. 



Sponges growing in small bushy masses of cylindrical or occasionally inflated 

 simple or branching stems, from 4 to 6 mm. in thickness. The cloacal aperture is 

 about 1'6 mm. in width. The exterior surface has a coarsely reticulate aspect. 



The fibres, in a transparent section of a specimen from the Great Oolite near Bath, 

 appear as well-defined bands, from -12 to '5 mm. in width, of the same character in 

 the central portions as near the exterior of the stem. They are composed of three- 

 or perhaps four-rayed spicules, with rays varying from '05 to '18 mm. in length, 

 indiscriminately mingled together. 



Distribution. Middle Jura: Couche a Polypiers — Langrune, Lebisey, Ranville, 

 Calvados {coll. Tesson). Great Oolite : Hampton Clifl", near Bath. 



