255 



Fig. 5. Young larva of TriiJiicuslea (jrulilla (Linn.), '.i days old. Dorsal view. The skeleton 

 has been dissolved, --"/i. 



6. Same as Fig.."); side view. '--"/i. s. c. suhoral eavity. 



7. I.arva probably belonj^ing to Toxopneusles roseiis (.\g.). Xol yet fully formed. 

 ■Slightly distorted. Ventral view. ""/i. 



5. Young larva of Tuxopncustes pUetilus (l,amk.), '.) days old. Venlral view, ''"/i- 



Plate IX. 



Fig. 1. Young larva of Slroiuii/locciilrotus /ranriscanus (\. .\g.)» I days old. Dorsal view. 



160/ 

 / 1- 



2. Larva of same species, 8 days old; ventral view. "°/i- 



■i. — - — — 10 days old; side view. "Vi- 



■i. Fully developed larva of Strongi/locentrnliif; franciscanus, taken pelagieally. Draw-n 



from a preserved specimen. The course of the ciliated baud along the sides not 



(|uile distinct in the specimen. '■'"/,. 

 .■). Larva of Slronuyldccnlrdliis piilcherrimu^ (A. .Ag.), 1 weeks old. \'entral view. -°°/i. 

 Figures 1 — '.i and ."> drawn from life. 



Plate X. 



Fig. I. Young larva of Hvrrhinus chtoroticus (Val.), 11 days old. Ventral view. ""/,. 



2. More advanced larva of same species, 3 weeks old. Dorsal view. ""/,. 



3. Fully developetl larva of same species; nearly .") weeks old. Ventral view. '*°/i- 

 4 — 5. Two abnormal young larv;e of Erechinus chloroticus. '"/,. 



6. Nearly fully developed larva of Temnopleurus toreumaticus (Klein); ventral view. 

 9 days old. l^rawn from life. '*"/i. 



7. Fully developed larva of Araclinoides placenta (L.), 7 days old. Ventral view. "°/p 



Plate XI. 



Fig. 1. Young larva of Ililiariddris luherrulala (Lamk.), 6 days old. Dorsal view. '-'/i. 



2. Fully formed larva of same species, .5 weeks old. Ventral view. In the posterior 



end a pedicellaria has appeared; a muscle is seen conncctiTig the lower ends of the 



postoral rods. Drawn from life, ^^"/i- 



:i. Larva of Temnopleurid, species c. Slightly restored. The true shape of the epaulets 



not to be ascertained. ""/,. 



4. Larva of Erhinohrhsus (Otigopodia) recens (M. Edw.), 4 days old; ventral view. '"'/,. 



Plate XII. 



Fig. 1. Larva of luliiiiomilra huiinlir (Linn.), 7 days old; dorsal view. The body skeleton 

 has begun to be absorbed. Drawn from life. Showing the nervous system (the 

 oblique line on the anal area, at the base of the postoral arms). '--'",. 



2. Larva of Echinomcira (ihloiuju (Hlv.). 12 days old; side view. Body skeleton partly 

 dissolved, -""/i- 



3. Larva of same species, same age; ventral view. The skeleton has been omitted 

 in the figure, being partly dissolved so that a correct drawing of it could not be 

 made. (Comj). tig. 2). -"V,. 



4. Larva of Colobocenlroliis alratus (Linn.), 12 days old; side view. '-'"'/,. 



."). Larva of same species, same age; ventral view'. Skeleton dissolved. Drawing from 

 a preserved specimen, combined with a sketch from life. -""/,. 



0. Young larva of Temnophunis lureiimaticus. 22 hours old: ventral view. The ciliated 

 band rather too distinct in the ligure. --"'i. 



Plate XIII. 

 Fig. 1. Echinnpliiltiis Iran.wersus. species c. Ventral view, "'/i- 



2. a. — Slightly corrected, the postoral 



band having been shown in what is evidently its normal place, not in the place 

 where it is seen in the specimen, below the end of the ventral transverse rods. '*'/i. 



