310 ZOOPHYTOLOGY. 



quainted is in his collection in the British Museum. The pre- 

 sent figure was taken from a specimen collected by Mr. Alder, 

 in Guernsey or Jersey ; it was on an oyster-shell. 



8. L. 2)U)ictata, Hassal. (Brit. Mus. Cat., p. 79.) PI. XI., figs. 4, 5. 

 The form here figured seems to correspond with L. punctata, 



in its most perfect state ; it was collected in Gibraltar Bay, 

 growing on shell, by the late lamented Dr. Landsborough. 



9. L. californica, n. sp. Busk. PI. XL, figs. 6, 7. 



Cells broadly-ovate, surface minutely punctured ; a lunate pore in front, 

 a little below the mouth ; an avicularimn on either side above. Mouth 

 rounded above, lower lip straight, four superior marginal spines. Ovicell 

 small, sub-immersed. 



Hab. California, Dr. Gould. 



The specimen of this well-marked species was furnished to 

 me by the kindness of Dr. Philip Carpenter. In the older 

 cells the front is so much raised, that the mouth and the lunate 

 pore, with the surrounding part of the surface of a triangular 

 shape, lie in an almost horizontal plane. 



Gen. 3. Alysidota, n. gen. Busk. 

 Char. " Cells disposed in a single scries, branching irregularly ; one 

 cell arising from another by a broad base. Surface usually punctured." 



In the ' Brit. Mus. Cat.' of Marine Polyzoa, p. 82 (PI. 

 XCII , figs. 1, 2, 3), a species of Lepralia is described, and 

 figured under the specific name L. labrosa, in which the cells 

 are disposed for the most part in linear series, branching out 

 irregularly from a central point, where some of the cells are 

 crowded together without any definite order. In the absence 

 of other forms having a similar mode of growth, it seemed 

 better to include this species under Lepralia, of which it might 

 be regarded as an aberrant form, and to which, at any rate, it 

 appeared to be very closely allied, than to erect it into the type 

 of a distinct generic group. 



Lately, however, we have been furnished by Mr. J. Alder, 

 with another form apparently very closely related to the 

 above in its mode of growth ; and it would now seem justi- 

 fiable to constitute of these dendritic polyzoaries a separate, 

 perhaps subgeneric group, of which L. lahrosa, Busk (' Brit. 

 Mus. Cat.,' p. 82, PI. XCII., figs. 1, 2, 3), would form the 

 type. The name is taken from the chain-like disposition of 

 the cells. 



The genus differs from Lepralia in the disposition of the 

 cells, which are, for the most part, arranged in linear series, 

 branching out in various directions in a dendritic manner. 

 From Hippothoa, it is distinguished by the circumstance, that 

 the cells arise from each other by a broad base, and are not 



