246 Dr. Maron‘sictd Mr. Rackett’s ` 
17. 
bicornis, S. testa bicorni, ventricosa. Walker Test. Min. Rar. t. 1. 
ft 2. § fF. 3. 
Adams Micr. t. 14. f. 2. & 3. 
Montagu Test. Brit. p. xum Vermiculum ` mcorng, et 
V. perforatum. 
. Halitat in mari. 
— Testa 1 lin. longa, alba, opaca, i | 
Found at Sandwich and Reculver, by Mr. Boys. 
We may be permitted to express our doubts whether 
the four last Serpule ought not to be considered rather 
as varieties than as distinct species. "Their form is very - 
irregular and variable ; and it is scarcely possible to give 
any permanent characters by which they may be satis- 
factorily discriminated. 
18. 
incurvata.S. testæ extremitate posteriore involuta, anfractibus 
tribus contiguis. - | 
Walkér Test. Min. Rar. Zi. ECT 
Adams Microsc. t. 14. f. 7. z: 
Montagu Test. Brit. p. 518.  Vermiculum incurvatum. 
B. Walker Test. Min. Rar. HIA 
Montagu Test. Brit. p. 508. Vermiculum parvum. 
Habitat in mari, rarior. 
Testa vix 1 lin. longa, alba, semipellücida, levis, 
Varietds B. anfractu unico aperto. 
= Found on the Kentish coast. 
19; — b. Lagenzformes. — 
lactea. S. testa ovali, tenui, compressiore, venis lacters. 
~ Walker Test. Min. Rar. t. Lf 5. 
Adams Micr. t. 14. S. 4. mum 
: Montagu Test. Brit. p. 522. Vermiculum lcteum. 
Habitat 
