178 



CATALOGUE OF ADDITIONS TO, AND ALTERATIONS 



Varies much at times,-^— often very beautiful. It occurs on 

 the upper face of stones and shells, and Laminaria roots, in 

 shallow water, and on shells, &c. from deep water. It is wide- 

 spread and far from rare : I have met with it from Cornwall 

 to Unst, Shetland. (C.W.P.) 



Genus, Porella. — Gray. 



1 — P. CoNCiNNA. — Busk. 



Leprailia Concinna. — Brit. B.M. Cat., ii, 67, plate xcix, 



P. CoNCiNNA. — Mmch, Brit. M. Poly., 323, plate xlvi, 



Very variable according to age, and assumes many varietal 

 forms, it is common and wide spread. There are two varieties, 

 viz : a, Belli, (Dawson) ; and fS, gracilis. It is found on shells 

 and stones, generally from deepish water. 



Plentiful on the Cornish coast ; off the Deadman fine on 

 stone, 1869 (C.W.P.) Not rare in Shetland. 



2 — P. CoMPKESSA. — Sowerhj. 



MiLLEPORA CoMPREssA. — Sowerly, Brit. Miscel. i, (1806), 83, 

 plate xli. 



P. CoMPRESSA. — Hinclis, Brit. M. Poly., plate xlv, figs. 4 and 

 7, and woodcut fig. 14. 



EscHARA Cervicornis. — Bush, B.M. Cat., iii, 92, plate cix, fig. 

 7, cxix, fig. 1. 



Cellepora Cervicoris. — Couch, Corn. Faun., p. iii, plate 20, 

 fig. 1. 



This is the Porus cervinus of Borlase, Nat. His. of Cornwall, 

 240, plate xiv, fig. 7. 



" In the mode of growth there are many variations, but the 

 minute characters are sufficiently stable." — Hincks. I have 

 collected specimens from Cornwall, especially from off the 

 Deadman, and in Shetland in considerable numbers and in great 

 varieties of form when dredging with Mr. Jeffreys in 1864. The 

 southern forms are considerably larger and spread out into 

 much broader palmate tips, and more rounded and massive 

 branches below, than the Shetland examples, they are usually 

 much more delicate, their branches much more slender. So says 

 Mr. Hincks ; in this I fully agree, and as well that " the minute 



