568 ZOOLOGICAL LlTEUATUllK. 
Verrill, a. E. Synopsis of the Polyps and Corals of the 
North-Pacific Exploring Expedition, under Commodore C. 
Ringgold and Capt. J. Rodgers, from 1853 to 1856. Col- 
lected by Dr. W. Stimpson. Part IV. Proc. Essex In- 
stitute, vol. V. Nov. and Dec. 1867, pp. 315—333, plate 3. 
Part IV. continues Professor VerrilPs descriptions of the 
Polyps and Corals collected by Dr. Stimpson, and treats of the 
Actinaria. 
■ . Review of the Corals and Polyps of the AVest Coast of 
America. Trans. Connecticut Acad. vol. i. pp. 377-422 
(pp. 377-390, April 1868; pp. 391-398, June 1868; 
pp. 399-414, July 1868; and pp. 415-422, December 
1868). 
The Panaman fauna proves to be remarkably rich in Gor- 
gonidae ; no less than 36 species are described from it ; and at- 
tention is again called to the remarkable contrast that exists 
between the Polyp-faunae, of the Atlantic and Pacific coasts of 
'Central America. Prof. Verrill had called attention in 1864 to 
the dimorphic forms of the polyps of Renilla as rudimentaiy 
polyps.” 
. Critical remarks on the Halcyonoid Polyps in the Mu- 
seum of Yale College, with descriptions of new genera. 
American Journ. Sci. & Arts, vol. xiv. (May) 1868, pp. 
411-415. 
HYDROZOA. 
Reproduction . — Haeckel states that in several species of the 
Thaumantiadae of Gegenbaur lie has divided the umbrella 
into a hundred pieces, and from each piece, providing only it 
contained a portion of the margin of the umbrella, grew in a 
few days (from two to four) a complete small Medusa. Merely 
a loosened shred of the fringe on which the base, the adjoining 
piece of the edge of the umbrella, remained, formed a Medusa in 
a few days. With other Hydro-Medusie the result was even 
more suprising. Here he divided the globular, non-difterentiated 
mass of cells from the ovarian furrows into several pieces, and 
yet from each was developed a perfect larval form. (Haeckel in 
Monograph of the Monera, Jenaische Zeitschrift fiir Med. u. 
Naturwiss. 1868, iv. p. 84.) 
Corynidee, 
Halyhotrys, gen. nov., De Filippi, 1. c. p. 383, pi. 2. Polypary tubulous, 
erect, filiform, ramose, slightly complicated, with a few distantly placed 
branches. Polyps claviform, carried at the free extremity of the arms ; ten- 
tacles capitate, numerous, widely distributed. Gonophore simple, not medu- 
