Dr. E. P.Wright on a neio Species o/Pennella. 45 



three-jointed, the distal joint cheliiorra. On the front of the 

 head, on its ventral surface and surrounding the oral opening, 

 are a number of small cauliflower-like excrescences, of which 

 a few are more conspicuous than the others ; sometimes these 

 spring each from a separate base, sometimes two or more from 

 the same twig. At the junction of the thoracic with the ce- 

 phalic region there are two long horn-like appendages an inch 

 and a half each in length ; these arise from the dorsal surface, 

 and, like the thoracic and abdominal regions, are invested by 

 a thin, almost colourless integument, which forms a kind of 

 tube around them. 



Thoracic region. Applying this name to the region inter- 

 vening between the horn-like appendages and the origin of 

 the ovisacs, it is 5| inches in length : for the first three inches 

 it is about an eighth of an inch in diameter ; it then gradually 

 expands until, where it joins the abdomen, it is fully a quarter 

 of an inch in diameter ; the integument forms a clear tube- 

 like covering over it, and is quite smooth and glistening. 

 Close to the head, on the ventral surface, are four pairs of 

 minute appendages (feet), the first three pairs close together, 

 the fourth and most anterior pair somewhat separated from 

 the others : these very rudimentary feet, when highly magni- 

 fied, appear to end in a minute claw. 



Ahdominal region. At the commencement of this region, 

 and from its ventral surface, the two long ovisacs arise ; these 

 measure just 11 inches in length; they are straight, and ap- 

 pear obscurely jointed, joints long. The plumose filaments are 

 lateral and numerous ; they are compound ; that is to say, from 

 two to five spring from the same base ; but the common basal 

 portion is very short ; towards the anal orifice they are gene- 

 rally given off in pairs. The terminal portion of the body is 

 destitute of filaments ; the anal orifice is oval, central, and 

 terminal. 



Colour (as seen some days after death, preserved in sea- 

 water). Head and horns of a bright brown colour ; body, seen 

 through the glistening investing membrane, of a dark olive- 

 brown, with circular stripes of a lighter hue ; ovisacs greyish 

 white ; plumose appendages deep black, but the clear integu- 

 ment investing these gave the terminal points of each the 

 appearance of being tipped with silver. 



Male unknown. 



Habitat. In the body of Orthagoriscus mola, on either side 

 of the dorsal fin. Cork Harbour, November 1869. 



Total length of the perfect specimen examined, from top of 

 head to anal opening, 7 inches. 



I am indebted for this species to my friend Dr. Harvey, of 



