108 CALIFORNIA ACADEMY OF SCIENCKS. 



PLATE XXXVIII. 



PONTODKILDS MICHAELSENI. 



Gt, Section throiigb the body iu somite xi, showing the sperm-aacs and their relative position. ». anterior septam. 

 (/. V. dorsal vessel. h. hearts. <r. cesophagus. v. v. the hrauehed ventral vessel, sp. ». the racemose 

 sperm-sacs situated much veutrally of the intestine. »i. c. ventral nerve cord. /. m. and (. m. longitudinal 

 and transverse muscles of the body. 



65. A cross-sectiou of the same region more magnified, s. x/xi. septum between x/xi. «. xi/xii. septum between 

 xi/xii. sp. n. one of the sperm-sacs. .«/):. spermatozoa. 7». c mother cells, c. r. ciliated rosette, m. ra. 

 muscles connecting the septum below the sperm-sac with the oesophagus. 



00. .\ more longitudinal section of the ciliated rosette, showing the muscles and the blood vessels in the thick 

 funnel. 



07. Another section through the ciliated rosette, showing the thick layer of blood vessels below the ciliated 

 epithelium. 



OS. \ cross-section through the glandular part of the prostate, near the entrance of the spermduct. ep. epithelial 

 cells with round nuclei, r. m. circular muscles, e. glandular cells, m. muscles connecting with the body- 

 wall, sp. d. spermduct. 



09. (!ros8-section Ihrnugh the muscular part of the prostate. 



