14 MEMORIAL PAMPHLET SHOWING CERTAIN DRAWINGS 



Woods Hole, Massachusetts, late in summer, being abundant in some years and rare in others. 

 . I am in accord with Hargitt in believing that E. rnira is identical with E. hmpida. 



The development of Eutiina mira has been studied by Brooks, 1884 and 1886, who 

 reared the hydroid from the egg. The gastmla is formed by delamination of the entoderm 

 from the inner ends of the ectoderm cells. This takes place most rapidly at the narrow end 

 of the pear-shaped planula. This narrow end afterwards becomes invaginated; the invag- 

 inated cells are, however, ectodermal, and have nothing to do with the gastrula cavity, but 

 they form the cement gland which soon serves to attach the larva. One lip of this orifice ot 

 invagination grows faster than the other, so that the cavity is soon pushed to one side and 

 the larva becomes bilateral. When the larva attaches itself this invaginated ectoderm is pro- 

 truded and pours out its cement. The planula then elongates and forms a layer of perisarc 

 which fastens it throughout its entire length. It thus becomes a hydrorhiza, not a hydranth. 

 The first hydranth buds out at right angles to the length of the hydrorhiza at the end opposite 

 to the cement gland. As soon as the first hydranth has acquired mouth and tentacles another 

 buds out close to the base of the first and so on. The planula, therefore, persists as a root 

 (hydrorhiza) and produces the hydranths by budding. 



The young hydranth has a tentacular basal web and 5 large alternating with 5 smaller 

 tentacles; 10 in all. The body of the hydranth is elongated and cylindrical, and is not covered 

 by the perisarc which invests the unannulated stem. The hydroid is a Campanopsis, very 

 similar to that from which Claus, 1881, reared Eutima (Octorclns] gcgcnbaitn. 



Eutima cuculata Brooks. 

 Eutima cuculata, BROOKS, 1883, Studies Johns Hopkins Univ. Biol. Lab., vol. z, p. 140. 



Bell about 8 mm. in diameter and quite flat, being about 4 times as wide as high. The 

 gelatinous substance is quite thick in the center, so that the cavity of the bell is very shallow 

 and forms less than half of the total height of the bell. The gelatinous substance diminishes 

 gradually in thickness from the center of the margin, where it forms a thin edge. 4 slender 

 tentacles, which are 3 or 4 times as long as bell-diameter. The basal bulbs of these tentacles 

 are small and there are no lateral cirri. Above the base of each tentacle is a small semi- 

 circular flap or hood, which is formed from the gelatinous substance of the bell. There are 9 

 or 10 very small marginal cirri in each quadrant. There are 8 lithocysts, 2 in each quadrant. 

 Each lithocyst contains 3 to 8 spherical concretions. There are 4 slender radial-tubes. The 

 peduncle is about as long as the bell diameter. It is conical above and prismatic below. 

 Stomach about one-fourth as long as peduncle, with 4 simple lips. There are 4 gonads upon 

 the 4 radial-canals, one on each canal. They extend from near the bell-margin to base ot 

 peduncle, but do not run down along the prismatic part of the peduncle. 



The stomach and the entoderm of the tentacle-bulbs are intense green by reflected light. 



This species was found by Professor Brooks at Beaufort, North Carolina, on August 

 7, 1880. 



The bell is flatter than in Eutima mira McCrady, the tentacles are longer, and the 

 marginal cirri less numerous, but the only really distinctive feature appears to be the semi- 

 circular flaps above each tentacle-bulb. 



