PLATE VI. 



0. stands foi ovarian ccrca. 



VXI-. 



i>i/. or "<•. oviduct 

 Oe. „ cesoi>ha<,ais. 

 o. n. ,, four optii 



A. (in fig. 1 ' stands for matured ovum. 



A. (in Ii;;. 8) .. body-cavity. 



A. (in fig. 6) ,, musculu8 adductor scutorum. 



/.'. stands foi ovum, ii"t fully matured. 



tands i i i ggs. 



*'. (in fig. 10) „ sue- . P- >> pancreatic 



oflon itudinal muscular fibri ,. peduncular nerve. 



// genital duct. \ S. (in figs. 4 and 6) stands foi 



,/. (ii, tands for epithelium of ovarian wall. 



i lij;. :',) ,. cement .huts. 

 tands for pancreatic gland. 

 OS. oi '■'. supracesophagi 

 OA. . genital aperture, 

 /. lalirum. 



/. .. .- eca of the so-i ailed livi r. 



M. . . mouth. 



S, in fie. 1" stands for runnel at the end of the oviduct 

 S 1 . itands for curious sack. 



t. „ testicular i 



W. „ body-wall. 



X. (in li^'. 2) stands for yolk-i lements o) i 



X. in figs. 10 ami 11) stands for unknown mass. 



I.-II1. stands for small optica] ganglia. 



Fig. 1. Part of one of the coeca of the ovarium of Scalpellum vulgare, Leach: magnified 

 685 diameters. 



Fig. 2. Nucleus with nucleolus of a nearly ripe ovarian egg of Scalpellum vulgan 

 Leach ; magnified 685 diameters. 



I 3. Part of a section of the peduncle of Scalpellum regiwm (Wyv. Thorns.), Hoet 



in its lower half: magnified 3 3 - diameters. Body-cavity, acting as the main 

 cement-duct. 



Figs. 4, 5. Pancreatic eland of Sc<i/]>rlhini paivllvhxjnuniita. Hock. 



Fig. 4. Part of .a transverse section through the cephalic part of the body ; magnified 



diameter-. 



Fig. 5. Section of the gland where it has its greatest diameter; magnified 106 

 diameters. 



Fig. 6-9. Anatomy of Lepas anatifera, Linne. 



Fig. 6. Sagittal section of the body ; magnified 1*5 diameters. 



Fig. 7. Lateral view of the upper and front part of the stomach, after the muscles ha\e 

 been removed ; magnified 8 diameters. 



Fig. 8. Frontal view of a pari of the stomach with the supracesophageal ganglia ; 

 magnified 8 diameters. 



Fig. 9. The eye and its ii rvation; magnified 58 diameters. 



Fig. L0. The apparatus by means of which the oviduct opens in Scalpellum vulgan 

 Leach ; magnified 1 00 diameter-. 



Fig. II. Same apparatus of Lepas hillii, Leach: magnified 58 diameters. 



