INVERTEBRATA, CRTPTOGAMIA, MICROSCOPY^ ETC. 81 



the eyes are absent, although they are well-developed in their 

 males. Finally, and omitting other points, we have to note that the 

 " caudal appendages " are very short in Gijcnus and very long in 

 Kroyeria. 



The new forms described receive the following specific names : (I.) 

 Cycnus: 1. crenilahri ; 2. lahri mixti ; 3. labri donavaini ; A. acantholahri 

 enoleti ; 5. lahri trimaculati ; Q. pagellihogneravei ; 7. canfhari grisei. 

 (II.) Kroyeria: 8. scylli caniculce; 9. carcharice glauci ; 10. acaniliias 

 vulgaris. 



New Parasitic Copepod.* — Paul Mayer, in continuation of his 

 carcinological studies, describes a new form — Ive balanoglossi — which 

 was first found by Dr. Spengel in Balanoglossus minidus ; principally 

 in the branchial region. The larger examples were observed to have 

 lost nearly all connection with their host ; of a tubular form, their 

 cephalic end is much thicker than their caudal ; the mouth organs and 

 the thoracic appendages are gi'eatly reduced in size, and the female 

 measures 9 mm. and the male 3 • 5 mm. (in their contracted state). 

 The abdominal region is excessively mobile, the anterior portion 

 almost passive, while the animal changes its position by a wormlike 

 contraction and expansion of its body. The first pair of antennae 

 hardly exhibit any segmentation, the second pair is simply hook- 

 shaped ; the only gnathites are a pair of apj)endages which are pro- 

 vided with strong hooks, and a pair of movable chitinous rods, which 

 are i^laced at the side of the mouth, and may possibly be the remnants 

 of the mandibles ; the first set, which seem to be maxillipedes, serve to 

 attach the male to the female. The ventral ganglionated cord seems 

 to be fused into a single ganglion, from which two well-developed 

 nerves, which give ofi" a number of branches, pass very nearly to the 

 end of the body. The enteric tract forms a sim^jle tube, without any 

 anal orifice ; the lumen of the oesophagus is completely obliterated by 

 the folds developed on its wall, and is provided with a strong chitinous 

 intima. There are no special circulatory organs, but there are a large 

 number of glands in the body ; peculiar among these arc the rosette- 

 like dermal glands, each of which consists of an aggregation of 

 elongated cells ; as to the characters of their secretion the author has 

 no observations to ofier. The generative organs are stated to be 

 normal in character, and the Naiqjlius-iorm has nothing remarkable ; 

 it has, however, no eye, and the place of this organ is occupied by a 

 grey mass ; two large vesicles, of unknown function, lie in the hinder 

 third of the body. *" 



The author was not able to observe the successive stages of deve- 

 lopment, and he is therefore unable to sjicak definitely as to the 

 systematic position of this creature. He thinks that it is sufticieutly 

 clear that it is one of the Lernasida, from the described forms of 

 which it seems principally to difter in having only two, instead of four 

 pairs of thoracic feet. The abdominal furca is small, and the males 

 are found either singly or in pairs near the generative orifice of the 

 female. 



* 'Mitth. Zool. Stat. Neapel.' I. iv. (187i)) \>. rAL 

 VOL. III. G 



