ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 251 



puts forward an account of tlie life-history of Tcenia lanceolata, and 

 gives figures in illustration. The other two species selected are 

 T. infundibuliformis, and the other the new species, T. echinobotJirida, 

 both of which belong to a group of the Tsenias which the author 

 proposes to call EcMndbothridia. These forms have the suckers, as 

 well as the rostrum, provided with hooks. The first-named species 

 has been found in abundance by the author in the intestines of 

 pheasants attacked by Syngamus trachealis. It seems that the first to 

 disappear are the hooks of the suckers, then the suckers themselves, 

 then the hooks of the proboscis, and finally the scolex gradually 

 becomes absorbed. 



The vpriter then gives a diagnosis of the new species, T. echino- 

 hotJirida, which he found in some fowls, and an account of the different 

 phases through which it passes. 



In conclusion, attention is directed to the very natural question, 

 Do other armed Tseni^e, and especially those found in man, follow the 

 same rules as to the progressive loss of the hooks and the final 

 absorption of the scolex ? Analogy would lead us to think so, and 

 there are observations on T. solium which support the proposition. 

 Leuckart, who has noticed it, attributed it to old age, and the author 

 gives a figure of one, in which we note that the proboscis is merely 

 represented by a slight eminence, without any hooks, and in which 

 the suckers have disappeared. In an example studied by Kiichen- 

 meister the hooks disappeared when the Taenia was not 8 mm. long. 



Echinodermata. 

 New Echinoidea.* — Professor Alexander Agassiz has published a 

 list of the specimens collected on board the U.S. Coast Survey 

 steamer ' Blake ' in the Caribbean Sea, 1878-79, and along the Atlantic 

 coast of the United States in 1880, together with short descriptions 

 of twelve new species : Dorocidaris Bartletti, Porocidaris Sharreri, Podo- 

 cidaris scutata, Aspidodiama microtuherculatum, A. Jacohyi, Asthenosoraa 

 Beynoldsi, Phormosoma Sigshei, P. Petersi, Echinus WalUsi, Palceo- 

 tropus Thomsoni, Palceopneustes Jiystrix, Hemiaster Mentzi, and Schizaster 

 Orbignyanus. It will be seen that many of these new forms belong to 

 some of the most interesting genera in the group ; in many cases 

 examples of species already described larger than any yet obtained 

 were taken by the dredge. 



Perivisceral Fluid of the Echinoidea.t— Mr. P. Geddes remarks 

 that the close resemblance between the uncoloured elements of the 

 blood, the amoeboid corpuscles, and the true Amoebce is very remarkable 

 in the class of animals which he has selected for study ; he is of opinion 

 that they ought to be able to lead us to a resolution of the important 

 question, Does the term amoeboid express any accidental analogy, or a 

 deep-seated resemblance ? 



The perivisceral fluid of Echinus sphcera or Toxopneustes lividus 

 is of a slightly greyish-red tinge, with a musk-like exhalation. The 



* Bull. Mus. Comp. Zool. Camb., viii. (1880) pp. 69-84. 

 t Arch. Zool. Expe'r. et Gen., viii. (1880) pp. 483-97. 



