264 MB. E. C. BOTJSriELD ON 



DESCEIPTION OF PLATE XXXII. 



Figs. 1 & 2. Male and female Stroiigylus Axei. X 25 diameters. 



Fig. 3. Side view of the tail of the male. X 66 diam. 



Fig. 4. Front view of the same. X 85 diam. 



Fig. 5. Side view of the lower end of the body of the female. X 65 diam. 



Figs. 6, 7, & 8. Head, portion of the body, and tail of the female. X 265 



diam. 

 Fig. 9. Tail and hood of the male. X 355 diam. 

 Fig. 10. Plan of the hood, with its lobes and rays expanded. X 225 diam. 



a, head, and a*, mouth ; h, chitin-lines and lumen ; e, closed oesophagus ; d, 

 muscular wall of same ; e, e, chylous intestine or mid gut ; /, rectum ; g, anus ; 

 h, vulva ; i, upper, and^, lower horn of uterus; Jc, k, ova ; k'^, chitinous shell ; 

 I, I, cleavage-lines of yolk, and /*, I*, nuclei of cells ; m, tail-cone of female ; 

 n, n^, right and left spicules ; o, accessory piece ; p, p*, right and left hood- 

 lobes ; q, q', upper and lower divisions of anterior ray ; r, antero-lateral ray ; 

 s, s*, upper and lower divisions of middle ray ; t, postero-lateral ray ; u, bifur- 

 cate extremity, and ?f*, trunk of posterior ray ; v, v, transverse striae of integu- 

 ment. 



Ifote. — AH figures were outlined with the aid of a camera ; the upper end of 

 fig. 8 being a little out of focus, is a trifle too broad at that part. — T. S. 0. 



On Shvina and OpTiidonais. By Edwaed C. Botjsi'ield, 

 L.E.C.P. Lond. (Communicated by Dr. J. Mueie, F.L.S.) 



[Eead 4th February, 1886.] 



(Plate XXXIII.) 



The recently published ' System und Morpbologie der Oligo- 

 cbseten ' of Vejdovsky contains many names new to science 

 among the genera and species tberein described ; and among 

 tbem the genus Slavina, formed to include the Nais a^jpen- 

 diculata of D'Udekem, and, as identical with it, the JSfais lurida 

 of Timm. Succinct and clear description of sjDCcies, adequate 

 for identification, can hardly be said to be the strong point 

 of Vejdovsky's work — possibly lie is reserving it for the promised 

 second part ; but as in the case of Slavina the description is 

 more clear than usual, and several figures are given, there can 

 be little doubt, as I hope to show, that his Slavina appendiculaia 

 is identical with the species described by D'TJdekem, but widely 

 difierent from that described by Timm. 



The species described by Vejdovsky has not come under my 

 notice j but of the Nais lurida of Timm I have had many speci- 



