THE 



MONTHLY MICROSCOPICAL JOURNAL. 



NOVEMBER 1, 1874. 



I. — Supplementary Bemarks on Appendicularia. 

 By Alfred Sanders, M.E.C.S. 



(^Read before the Eoyal Microscopical Society, October 7, 1874.) 

 Plate LXXX. 



At the beginning of this year I had the honour of laying before 

 this Society some remarks on two apparently new species of Ap- 

 pendicularia, belonging respectively to the genera Oikopleura and 

 Frittillaria ; a much larger number of specimens of the former, and 

 a longer time for examination, have enabled me, during the course 

 of this summer, not only to correct some misinterpretations of 

 structure, but also to add several details to my former paper. 



I have, unfortunately, not been able to meet with further 

 specimens of the species of Frittillaria which I then described, so 

 that my remarks will be entirely confined to the genus Oikopleura 

 on the present occasion. 



The species of this genus, the description of which I am now 

 about to complete, abounds on the south coast of England ; I have 

 found specimens in large quantities at Weymouth, Cowes, and 

 Newhaven, and it is to be presumed that they occur also in the sea 

 between those places. 



They are best caught in a musHn net left for a short time in 

 the tideway a little before high water, at about the period of the 

 spring tides ; the plan suggested by Dr. Fol, of bailing them out 



EXPLANATION OF PLATE LXXX. 



Fig. 1. — Neural view of Oikopleura. 

 „ 2. — Haemal ,, „ 



The tail is not represented, and is supposed to be cut off. 



A, Anus. ■ I, 1 ; I, 2 ; Intestine. 



B, Ae, External branchial aperture. In, Integument. 

 B, Ai, Internal „ „ M, Mouth. 



E, Endostyle. N, Nerve. 



G, Ganglion. O, Otolitlie. 



G, E, Generative gland. Q5, (Esophagus. 

 Gl, Glandular bodies attached to the 01, Olfactory organ. 



endostyle. R, Rectum. 



H, Heart. St, Rl, Right lobe of stomach. 



H, G, "Haus" gland. St, LI, Left 

 VOL. XII. Q 



