266 W. Lilljeborg on the Genera Peltogaster and Liriopé. 
per collum connexa. Nulli oculi, nulli pedes, nulleeque appendices 
branchiales. Pullus et sine dubio mas iisdem Bopyri admodum 
similes, et fere tantummodo pedibus thoracicis postremi paris; 
ungue longo et recto neque retractili armatis, diversi. 
EXPLANATION OF PLATE IV. 
Fig: 1. a. Liriope pygmea, female, containing eggs and young; attached 
to the Peltogaster Paguri, 6, which is fixed in its turn to Pagurus 
_ pubescens, Kroyer; all seen from above. 
Fig. 2. Liriope pygmea, female, dead and preserved in spirit, seen from 
above: a, anterior extremity of the body, or cephalothorax ; 
b, posterior part of the body; or matrix; ¢, the right, d, the left 
side. 
Fig. 3. Liriope pygmea, female, alive, seen from beneath: a, anterior 
extremity ; b, posterior part with the supposed anal apertiire, aud 
the fissure of the matrix between this aperture and the anterior 
part of the body (cephalothorax). On the cephalothorax the 
_miouth is seen as a black point. 
Fig. 4. The larva of Liriope seen from above: aa, anterior antenne, or 
first pair ; 5 b, posterior antennz, or second pair ; ¢ e, five anterior 
pairs of thoracic feet; dd, sixth or last pair of thoracic feet ; 
eé, five anterior pairs of abdominal feet; ff, last pair of abdo- 
minal feet, or caudal feet. 
ig. 5. The same, seen from the left side. 
Fig. 6. Pachybdella Carcini, seen in front (after Lovén): a, acetabulum 3 
, 6, orifice of the pallium. 
Fig. 7: The same; opened: a, acetabulum; 5, orifice of the palliim; 
c, the fleshy body; dd, the ramified external ovaries (ovarian 
_ cveca). ‘ , : 
Fig. 8. The organ of adhesion of Peltogaster Paguri, seen from beneath : 
a, the orifice of the mouth; 6, the buckler, to which the aceta- 
bulum is attached by its neck beneath the Peltogaster. In this 
buckler concentric striae of cement are seen; and attached to the 
margins of the acetabulum are fragments of the epidermis of the 
Pagurus to which the Peltogaster was attached. 
Fig. 9. The two primary ovaries of P. Paguri surrounded by a cellular 
membrane and different formative matters. . 
Fig. 10. Peltogaster sulcatus, filled with eggs and deprived of its pallium, 
The two sacs of eggs are completely united and surrounded bi 
the delicate membrane which clothes the cavity of the body, an 
which adheres by 4 cellular tissue to the inner surface of the 
pallium or skin. This membrane is produced at 6, over the 
inner surface of the short tube which surrounds the anterior 
orifice; aa, the two parts supposed to be male generative organs, 
robably vesicule seminales. 
Fig. 11. die of the seminal vesicles magnified. 
Fig. 12. Peltogaster Paguri, filled with eggs, seen from above (length 
13 millim.): a, acetabulum ; 5, anterior aperture of the body; 
c, posterior extremity of the body, with a fissure and internal 
line of demarcation between the two sacs of eggs, which is con- 
tinued towards the anterior extremity. 
Fig. 13, The same, deprived of the organ of adhesion, seen from beneath 
(length 9 millim.): a, the anterior orifice of the body; 5, the 
posterior extremity, with the boundary between the two sacs of 
eggs. 
