MALE ORGANS OP GENERATION. 203 



tolerably large, pear-shaped, and open by degrees, sometimes several 

 together, into the common sperm duct. The lower bladders are larger 

 and longer stalked. (Staphylinus.} 



2. Testiculi granulati. (PI. XXIX. f. 12 and 16.). The end of the 

 sperm duct is dilated into a bladder, which is entirely covered with 

 round, button-shaped blisters. (Blaps, Pimelia, Musca.) 



3. Testiculi vesiculosi. (PI. XXIX. f. 13.). The long testis con- 

 sists of several rows of little bladders, which are placed around the 

 extremity of the sperm duct. In Semblis there are three rows of such 

 bladders present. 



4. Testiculi vesiculoso-cirrati. (PL XXIX. f. 7- 6.). The reflected 

 end of the sperm duct feears several petiolated, larger, capitate bladders, 

 and between these there are fasciculi of smaller, ramose vessels, the 

 extreme ends of which originate from four delicate glandular bodies. 

 (Silpha obscura, according to Leon Dufour.) 



D. CAPITATE TESTES. The testis consists of several sometimes 

 round or long kidney- shaped glands, which lie at the end of the 

 common sperm duct, or each duct bears but one such glandular body. 



1. Testiculi capitato-simplices. (PI. XXIX. f. 17-)- Each testis 

 consists of a single, differently formed glandular body. In Lytta and 

 Meloii, this body is globose or uneven and granulated (f. 17-) ; in 

 Sialis, Phryganea, and Apis (according to Swammerdamm), it is 

 kidney -shaped, and the duct opens at the spot where the kidney is 

 emarginate. 



2. Testiculi capitato-gemini. (PI. XXIX. f. 18.). The sperm duct 

 is furcate, and each branch bears a similar round glandular testis. 

 Donacia and Callichroma have equal branches: in Lamia oedilis, the 

 superior one is longer (f. 18). 



3. Testiculi digitati. (PL XXX. f. 1.). At the end of the sperm 

 duct there are five conical glandular bodies, which extend in long 

 serpentine fine vessels. (Nepa.) This form is as it were intermediate 

 between the capitate and vascular testes. 



4. Testiculi capitato-compositL (PI. XXIX. f. 19 and 20.). The 

 sperm duct gradually divides into several branches, each of which 

 sends off one (Cetonia Prionus) or several capitate testes. (Lepisma 

 Cicada,) 



5. Testiculi capitalo-verticillati. (PL XXX. f. 2.). Each testis 

 consists of several globose frequently-compressed glandular bodies, 



