234 Miscellaneous. 



stratum. In this species the families are composed of but very few 

 cells, surrounded by a very large, more or less globular or elliptical 

 mass of transparent firm jelly. The species is very closely allied to 

 Chroococcus turgidus, var. ihermalis, Rabenh., from which it differs 

 in the outer jelly not being lamellated. 



The following is the technical description of the species : — 



C. thermophilus, sp. nov. 



Ch. cellulis singulis aut geminis vel quadrigeminis et in familias 

 consociatis, oblongis vel subglobosis, interdum angulosis, hand 

 stratum mucosum formantibus ; tegumento crassissimo, achroo, 

 hand lamelloso, homogeneo ; cytioplasmate viridi, interdum sub- 

 tiliter granulato, interdum homogeneo. 



Diam. Cellulae singulae sine tegumento longitude maxima ygVc '» 

 latitude maxima j-aV-o' • — SillimaWs Journal, July 1868. 



DescHption of two Sacculinidce. By M, Hesse. 



The author remarks upon the importance of the habitat of para- 

 sitic Crustacea in ascertaining their identity, and states that, with 

 but few exceptions, these animals are strictly confined to particular 

 species of Crustacea or fishes. He describes two new species of 

 Sacculinidce parasitic upon crabs. 



Sacculinidia Gibbsii. 



Larger than the examples found on Carcinus mcenas, being 25 

 millims. in length, 20 in breadth, and 10 in thickness. Its form is 

 rounded quadrate, slightly flattened laterally ; the pedicle, which is 

 short, presents on each side two rounded protuberances, reverted 

 towards the upper part of the body. The position of the anal orifice 

 varies in consequence of the contractions of the body ; it is generally 

 placed directly opposite to the pedicle. Its construction is exactly 

 as in the parasite of Carcinus moinas. 



The skin is thin, showing through it the meanders of the oviferous 

 tubes. It has a velvet-like appearance, and is very tense. The ova 

 are large, oval, and contain only a single vitellus. The eye appears 

 as a red spot ; at the middle of the body laterally are two round 

 black spots, which always occupy the same place. The colour of the 

 body is very deep yellow, with a reddish-brown tinge. 



The specimen was found, in January 1867, on the abdomen of an 

 example of Pisa Gibbsii, where it was not protected by the carapace. 

 M. Hesse remarks that it is singular that the Pisa had not freed it- 

 self from its parasite, which it could easily reach. 



Sacculinidia Herbstia nodosa (!). 



Measurements, 25x15x5 millims. Resembles the parasite of 

 C. mcenas in form, but presents laterally two horizontal expansions, 

 one forming a cylindrical process, the extremity of which is curved 

 downwards like a hook. Anal aperture placed at the middle of the 



