OF THE HYDROMEDUS^. 395 



two species which have been traced to their hydra stage, this is a Campanopsis, or a 

 Campanularia-like hydroid without a calyx. 



Eutima intra, McOrady. 



Eutima mira, McCrady, 1857. Gymnopthalmata of Charleston Harbor, p. 88, PI. 2, 



figs. 8 and 9. 



L. Agassiz, 1862. Contributions, iv, p. 363. 



A. Agassiz, 1865. JST. A. Acalephse, p. 116. 



Haeekel, 1879. System der Medusen, p. 191. 



Brooks, Studies Biol. Lab. 1882, p. 

 Species-Diagnosis. Umbrella, when contracted in swimming, nearly hemispherical, 

 about two-thirds as high as wide. Proboscis slender, slightly enlarged at base, four or 

 five times as long as the diameter of the bell. Stomach of greater diameter than the pe- 

 duncle at its junction with the stomach, about three times as long as wide, quadrate in 

 cross section, and less than half as long as the height of the bell. Edges of the month 

 folded to form four everted radial lips, separated from each other by four interradial 

 inverted folds. Reproductive organs linear, sometimes extending from near the edge of 

 the bell nearly to the base of the stomach, sometimes divided into a sub-umbral and a 

 peduncular portion, either of which may be present alone. Four tentacles, with enlarged 

 hollow bulbs, six or seven times as long as diameter of bell, sometimes with basal cirri, 

 sometimes without. Numerous marginal tubercles, with or without cirri. Marginal ves- 

 icles with one large medium otolith and two or three pairs of smaller ones. Bases of 

 tentacles covered by hood-like gelatinous projections from the umbrella. 



Color. Almost perfectly transparent, endoderm of tentacular bulbs yellowish red. 

 Size. Umbrella 12 or 13 mm. in diameter and about 8 mm. high. 

 Habitat. Charleston, S. C, McCrady; Beaufort, N. C, Brooks. 

 Remarks. This is a very active and graceful species and the specimens which I 

 kept in aquaria were seldom at rest. When swimming the tentacles and proboscis 

 are usually extended to their full length, as shown in PI. 39, fig. 2, but when 

 the animal is floating at rest or sinking to the bottom, the tentacles are swept into 

 graceful folds by the resistance of the water, as shown in fig. 7. As the animal rises 

 rapidly from the bottom the tentacles are thrown into undulations by the flapping of 

 the bell. "When contracted in swimming, the outline of the umbrella is nearly hemi- 

 spherical, but when at rest it is slightly emarginated, as shown in McCrady's figure. 

 In an oral or an aboral view, the outline of the umbrella is not circular but produced to 

 form four rounded, radial projections or hoods over the bases of the tentacles. The en- 

 larged bulbs at the bases of the tentacles taper rapidly into the slender, hollow shafts, 

 which may be extended to seven times the diameter of the bell, and are never com- 

 pletely retracted but lie around the medusa in loose, irregular coils when it lies at rest 

 on the bottom. In nearly all the specimens which I examined, the radial canals anasto- 

 mose with each other through an irregular plexus of canals around the base of the 

 peduncle, as shown in PI. 39, fig. 3. Some specimens have coiled accessory tentacles on 

 each side of the bulb of each radial, but these as well as the marginal cirri are often 

 absent. 



