300 BULLETIN OF THE 



of lasso-cells, each situated on the outer surface of the bell in a position slightly 

 removed from the bell rim, and midway between the tentacles. Each cluster 

 is connected with the bell margin by a small body which bears some likeness 

 to one of the peroniae of Cunina. 



This larva is the youngest Willia yet figured.* It has been raised into an 

 adult, and there is therefore no doubt of its relationship. 



In a Willia observed by Dr. Brooks at Beaufort, N. C, there are stolons 

 attached to the outer walls of the munubriuni, and upon them are found 

 budding medusa) in all stages of growth. 



The accompanying figure f of Willia shows a stage in which there are only 

 eight tentacles, and each of the four chymiferous tubes has a single bifurcation. 

 If this budding Willia represents a stage in the development of W. ornata, it 

 is intermediate between the youngest medusa described above and that which 

 is figured as the youngest Willia by Mr. Agassiz. At present, I cannot say 

 from the facts which are known whether it is a new species, a stage in the 

 development of W. oriiata, or a dimorphous form of the latter. The difference 

 in the chymiferous tubes in it and in W. ornata of the same age is very great, 

 as will be seen by contrasting Fig. 24 with those of the young Willia by Mr. 

 Agassiz. It may be a new species, W. gemmifera. 



II. Acalephce collected by the IT. S. Fish Commission 

 during the Summer of 1880 and 1881. 



The collection J of medusae here described was taken by the members 

 of the Commission off the New England coast in the summers of 1880 

 and 1881. The finds of the latter year were the most valuable, so far as 

 the collection sent to me is concerned. 



The collection contains two Ctenophores, which should probably be 

 referred to the genus Bero'e. The species could not be determined. 



Among the Siphonophora there is a magnificent new Physophore, 

 Haliphyta, gen, nov., Agalvia elegans, Fewkes, A2:)olemia, sp., Diphyes, 

 sp., and Gleha hippopus, Forsk. 



* A medusa doubtfidly referred to Cytxis by Will (Hora; Tergestinae, V\. II. 

 fig. 7) is possibly the same. 



t The figure of a Willia, with attached stolons, was contributed by the courtesy of 

 Dr. Brooks. Consult his notice, "Budding in Free Medusse," Amer. Naturalist, 

 Sept., 1880. See also Huxley, Anatomy of the Invertebrated Animals, p. 132. In 

 the Willia mentioned by Huxley the stolons arise from the bifurcations of four radial 

 tubes. 



X An assorted collection from which Prof. Verrill had excluded many previously 

 known medusoe collected by the commission at the same time. For an aceoniit of 

 the explorations in the summer of 1881, see Prof. Verrill's paper, Am. Jour. Arts aud 

 Sci., XXII., Oct. 1881. 



