10 MUSEUM, BROOKLYN INSTITUTE OF ARTS AND SCIEXCES. 
Turritopsis nutricula, McCkady. 
McCrady, J., 1857; Gymn. Charlestun Harbor, p. 25, Pis. IV, V, VIII, Fig. 1. 
Modeeria multitentacula, Fewkrs, J. W. 1881; Bull. Mus. Comp. Zool. at Harvard Coll., 
Vol. VIII, p. 149, PI. Ill, Figs. 7-9. 
Brooks, W. K., 1886; Mem. Boston Soc. Nat. Hist., Vol. Ill, p. 388. PI. 37. 
Bell 4 mm. high. Pear-shaped, with thin walls. 40-50 mLU'<;iiial tentacles, 
each with an ocellus on the outer side near the basal bulb. Four narrow 
radial canals. Manubrium wide, flask-shaped and one-half as long as the 
depth of bell cavity. Proximal part of manubrium contains large vacuolated 
cells, through the midst of which the four radial canals extend into the gas- 
tric portion of the manubrium. Mouth at end of a short cylindrical tube, and 
surrounded by four radially-situated uematocyst-bearing knobs. Gonads 
within the manubrium. Entoderm of manubrium dull yellow streaked with 
brownish orange. Ocelli of tentacle bulbs brown or orange. The hydroid, 
discovered by Brooks, is Dendroclava. Medusa common from Cuba to New- 
port, Rhode Island. Rare at the Bahamas in summer. 
Lymnorea Alexandri, sp. uov. 
Figs. l-5a, Plate I. 
Named in honor of Alexander Agassiz. Bell 4 mm. high, 3 mm. broad, 
with vertical sides, flat top and thin walls. Thirty-two slender tentacles with 
tightly coiled ends and large basal V)ulbs. A l)lack ectodermal ocellus lies 
upon the outer side of each tentacle-bulb. The velum is well-developed. The 
four radial canals are straight and slender but slightly swollen in the mid- 
regions of their lengths, where their inner sides are lined with gland-cells. 
(Fig. 5% Plate I.) 
The manubrium is flask-shaped and about one-half as long as the depth 
of the bell-cavity. The distal part of the manubrium adjacent to the points 
of entrance of the four radial canals is composed of highly vacuolated cells. 
The mid region of the manubrium is cruciform in cross section and the 
mature genital products are found in the ectoderm. The mouth is at the ex- 
tremity of a short neck, and is surrounded by foTir oral tentacles, each of 
which branches dichotomously three times, and (cnninatcs in eight nemato- 
cyst-bearing knobs, making in all tliirly-lwo of llicse knobs surrounding the 
mouth. The entoderm of the manubrium and tentach^bulbs is dull, flesh- 
colored pink. In the youngest medusa seen the bell was 0.(5 mm. in diameter, 
and had only four oral tentacle knobs, four marginal tentacles and four rudi- 
