f?82 NOTES ON SOME BRITISH NUDIBRANCIIS. 



28. Alderia modesta. A longitudinal section cut slightly to the left of the median 



line and not quite sagittal. It does not show the mouth and buccal mass 

 very distinctly, but gives a better view of the rest of the digestive tract 

 than is obtained by a median section, a. left side of mouth ; b. left side 

 of buccal mass ; c. left side of central nervous sy.stem ; d. cesophagus ; 

 e. tube with laminated walls running into the stomachic pouch ; /. point 

 where the intestine commences, the intestine runs somewhat to the right 

 but reappears for a moment at/^ ; y. stomachic pouch ; h. anterior diverticu- 

 lum of the pouch ; i. i. i- lateral diverticula in the foot and cerata ; j. 

 albumen gland ; k. renal organ ; I. uterus (the organ marked i. in Fig. 27), 

 which on being cut has expanded and spread dorsally at the expense of 

 the renal organ and pericardium ; m. portions of the hermaphrodite duct 

 containing masses of spermatozoa ; n. prostate. The remaining parts of 

 the drawing are mo-stly lobes of the hermaphrodite gland. 



29. Alderia modesta. Transverse section cut at tliu jioint marked by an arrow in 



Fig. 27. e. h. I. n. as in the longitudinal section (Fig. 28) ; /. the intestine 

 passing over to the right side ; i. i. latero-dorsal diverticula of h. ; m. a 

 prolongation of the hermaphrodite duct ; o. the female branch running for- 

 ward into a pouch (? spermatotheca) ; j^. ditto running backwards from the 

 pouch ; V. vas deferens ; s. one of the prostatic tubules entering into the 

 vas deferens. 



30. Alderia modesta. Central nervous system, a. right cerebro-pleural ganglion ; 



b. right pedal ganglion ; c. right visceral ganglion ; d. median visceral 

 ganglion ; e. left pedal ganglion ; /. left visceral ganglion ; y. left cerebro- 

 pleural ganglion. 



