n.ni Mii;i:-MMii:.s. 



?>m 



.same ^•(■iius as the ' I'laf/nsia'" that Sri;i:NSTi;rr iiail (il>- '.'S)''. In lli'' ti'iic Flatlislics this shape, which is (h-ej)- 



taiiied tVciin different parts of the Alhintic en<'il only hy ihi' confiMiioiis vertical tin, without true 



The most reniarkulih' point in the appearance of rays, whii-h extemls ii-oui the occiput i-ouml the tip ol 



the larxu' of the Flatfisiu's for the first few (hays ;ifter the tail to the \cnt. may lie retained until the tail has 



tlie\ ha\e left the eii-ji', is t he cloiiLiated, ;dniosl l".el-like assumed its licterocci-cal form and developed true lin- 



shaiie of the hod\ in the majorilx of the spe<-ies (Iil:-. I'ays, The jiectoi-al tins li;i\e now .-ippi'iired. 'I lieu the 



Fig. 90. Continuation of tlie cliangcs of growtli in tlic fry of Pleuroticcte." ,iiiievir(uiiii^. Tlic body of tlie larva- now grows deeper, tlioiigli 

 cliiefty owing to tlie more and more distinct separation of the dorsal and ventral iius from the caudal fin, </, a larva 8 mm. long, with the 

 left eye moved slightlv forward, wliicli apprars from its altered position, first with relation to the brain, and second with relation to the 

 hind (lower^ end of the upper jaw-bone. Rudiments of tiie hypural bones now present under the raised posterior tip of the notochord 

 //, a rather more advanced larva, with the left eye visible from the right side of the body, raised slightly above the nasal profile, and mov 

 ed forward to a point about '/, its own length in front of the right eye. Caudal fin rounded, and rudiments of the ventral fins visible 

 c, a larva 12 mm. long, with more distinct ventral fins and with the left eye moved still farther forward. </, with the greater part of the 

 left eye visible from the right side, e, a young specimen nearly 18 mm. long, with the left eye at the <lorsal margin of the head, but 

 almost entirely transferred U> the right side, where it has also moved slightly brick, while the front part of the dorsal fin 



has begun to develop to the left of it. .\flcr A. AoASSlz. 



" That these small Flatfishes belong to the group of the Sole, is hardly probable. They are most like those larvw which R.aff.xELE 

 (Mith. Zool. Stat. Neapel, 15d. VIII, p. 51, pi. 3, figs. UJ and 18) referred to the genus Anwijlossus. A true, transparent genus of Sole, 

 on the other hand, or a larva thereof seems to be described by nftcWN-OooPK (Proc. U. S. Nat. Mus. 1880. p. 344) under the name of 

 Tliyris pellucidus, from the deep water oft' Xewjiort. 



'■ Sometimes the larvic are furnished with a long occipital Hnray ev.n in this stage: see R.uf.aEI.e. 1. c. pi. .S. fig. 12. .ind perhaps 

 Emeuy, the same magazine. Vol. VI, pi. 10, fig. 20. 



