102 



ACALEPHS IN GENERAL. 



Part I. 



as with the common Acalophs, might appear true were it not known that the 

 Ascidians, to which Salpa^ belongs have a mantle consisting of CeUulose/ while of 

 all Acalephs the Ctenophora^ are the most perishahlCj and dissolve entirely in 

 water, — their body, however, consisting of cells of the same kind as those of the 

 other Acalephs. 



BOLINA ALATA, Ag. 



* (Seen from the broad side.) 

 I and / Long rows of locomotiTe fringes. — 

 g and h Short rows of locomotive fringes. 



— o Central black speck (eye-speck?).— 

 i to ni Triangular digestive cavity. — i to o 

 Funnel-like prolongation of the main cav- 

 ity, — V Ohyuiiferous tube of the tenta- 

 cular apparatus. — j/i Tentacular appa- 

 ratus on the side of the mouth. — r r Ear- 

 like lobe, or auricles, in the prolongation 

 of the short rows of locomotive fringes. 



— 1 1 Prolongation of the vertical chymife- 

 rous tubes. — n n The same tubes turning 

 upwards. — xz Bend of the same tubes. 



— z z Extremity of the same tubes meet- 

 ing with those of the opposite side. — u* 

 Recurrent tube anastomozing with those 

 of the auricles. 



Fiff, 56. 



BOLINA ALATA, Ag. 



(Seen from the narrow side.) 

 lb Long rows of locomotive fringes. — c /t 

 Short rows of locomotive fringes. — o Cen- 

 tral black speck (eye speck?). — i Upper 

 end of the digestive cavity. — i to o Fun- 

 nel-like prolongation of the main cavity of 

 the body. — w to i Digestive cavity. — rr 

 Auricles. — m Mouth. — t t Prolong- 

 ation of the vertical chymiferous tubes. 

 — )i ii The same turning upwards. — xx 

 Bend of the same tubes. — z Anastomosis 

 of the two longitudinal tubes tt. —ww 

 Recurrent tube, anastomozing with those 

 of the auricles. — A comparison of this fig- 

 ure with Fis- 4 gives a distinct idea of the 

 relative position of the digestive cavity m 

 to f, and the chymiferous tubes of the ten- 

 tacular apparatus v. 



BOLINA ALATA, Ag. 



(Seen from above.) 

 I Central black speck (eye speck?). — abef 

 Long rows of locomotive fringes. — cdgh 

 Short rows of locomotive fringes. — tt 

 Auricles. — s 5 Circumscribed area of the 

 upper end of the body. 



Fig. b1. 



BOLTNA ALATA, Ag. 



( Seen from below. ) 

 n Mouth. — TT Auricles. — tttt Prolong 

 tion of the vertical chymiferous tubes. 

 z z Anastomosis of these tubes. 



As to the assertion that the Ctenophoroe are bilateral animals, it is only in so 

 far correct that tlie Ijody is more or less compressed, as the adjoining wood-cuts 

 show {Fiffs. 54, 55, 50, and 57), which represent a Bolina most common along 

 tiie northern Atlantic coast of America. But tlie arrangement of all the parts of 

 these animals is truly radiate. Their bilateral appearance is only the result of 

 the inequality of their sphcromeres, as is the case with the Spatangoids also, and, 

 in a less degree, with all Echinoderms. But in all those animals the structvu'e 

 is typically radiate, and the bilaterality subordinate to the plan of radiation, in the 

 same manner as in Cephalopods and in Bryozoa the radiated arrangement of the 

 arms and tentacles is subordiirate to their bilateral typo. The closest comparison 

 of the structure of the Ctenophoro? Avith that of the Br3-ozoa and Tunicata on 

 one side and the common Medusa) on the other, will show, that, while all their 



' See the memor.able paper of Kollikek .ind 

 LowiG : De la composition et de la structure des 



enveloppcs des Tuniciei's. 

 vol. 5, p. 193. 



Ann. Sc. Nut. 



