Notes from the St. Andrews Marine Laboratory. 97 



drilidaj, it seems on the whole probable that they are neai'ly 

 akin. Provisionally therefore I include the new genus 

 described in the present paper in the family Ocnerodrilida3. 

 I am not at all certain, however, that the likeness is not the 

 result of a convergence due to simpUHcation in the same 

 direction. Both Ocnerodrilus and Gordiodrilus are chiefly 

 to be defined by negative characters. 



V. EXPLANATION OF THE PLATES. 

 Plate VI. 



Fiy. L Gordiodrilus elcgans. Ventral surface of genital segments repre- 

 sented as being seniitranspareut. at, atria ; v.d, vas deferens. 



Fig. 2. Gordiodrilus dominicensis. Ventral calciferous gland. /, lumen 

 of gland opening into oesophagus ; 7i, nephridium, apparently 

 continuous with intracellular part of lumen of gland ; s, inter- 

 segmental septa. 



Fig. 3. The same. A portion of intracellular part of lumen of calcife- 

 rous gland viewed superficially and showing connexion with 

 nephridium (ii). 



Plate VIL 



Fig. 4. Gordiodrihts robusius. A spermatotheca. 



Fig. 5. The same. Longitudinal section through genital segments, to 

 show external orifice of atria {at.) and vas deferens ( c? )• /, inter- 

 segmental furrow ; s, seta. 



Fig. 6. A. Gordiodrilus elegcuis ; B. G. robvMus ; 0. G. tenuis ; all of 

 natural size. c5' , male pore ; 7;, genital papilla. 



Fig. 7. Gordiodrilus clegans. Spermatotheca. 



Fig. 8. Gordiodrilus ditheca. Longitudinal horizontal section through 

 oesophagus (a's.) and calciferous gland (C'ac). S, septum; T, 

 testis ; H, heart ; Per., peritoneal cells ; a, glandular cells sur- 

 rounding calciferous gland ; vac^ vacuole. 



X. — Notes from the St. Andrews Marine Laboratory [under 

 the Fishery Board for Scotland).— ^o. Xlll. By Prof. 

 MCINTOSH, M.D., LL.D., F.R.S., &c. 



[Plate Vni.] 



1 . On the Eggs and young Stages of the Sand-eels. 



2. On the Ova and Larvae of certain Pleuronectids. 



3. On Clyniene chiensis, And. & Ed. 



4. On the Atlanta-like Larval Mollusk. 



1. On the Eggs and young Stages of the Sand-eels. 



The reproduction of the sand-eels has hitherto been involved 

 in obscurity, though considerable attention has been given to 

 the subject at St. Andrews for several years, e. g. by Mr. W. L. 

 Calderwood and others. Similar investigations were carried 

 out elsewhere by the late esteemed and conscientious observer, 

 Ann. d; Mag. N. Hist. Ser. G. VoI.k. 7 



