256 BULLETIN OF THE MUSEUM OF COMPARATIVE ZOOLOGY. 



PLATE V. 



Fig. 23. Pallenopsis forficifer ; glandular duct from 4th joint of ambulatory legs in 

 the male. 



Fig. 24. Pallenopsis longirostris ; the corresponding duct. 



Fig. 25. The same ; outer joints of accessory legs. 



Fig. 26. Scceorhynchus armatus ; chela of "antenna" in male. 



Fig. 27. The same ; chela of female. 



Fig. 23. The same ; palpus. 



Fig. 29. The s;ime ; terminal joints of leg. 



Fig. 30. The same ; outer joints of accessory leg in the female. 



Fig. 31. The same ; spine from accessory leg, male. 



Fig. 32. Colossendeis niacerrinui ; dorsal view of oculiferous segment showing ori- 

 gin of palpi, accessory legs, and first pair of ambulatory legs. 



Note. — "WTiile this article was going through the press an important paper by 

 Dr. P. P. C. Hoek was received. (The Pycnogonids, dredged during the Cruises of 

 the "Willem Barents'* in the Years 1878 and 1879. Niederlandisches Archiv fur 

 Zoologie, Supplementband I., Erste Lieferung, 1881, Art. II., pp. 1-28, Plates I. 

 and II.) The author states that Colossendeis v!a.s described in the year 1870; this 

 name has therefore prioritj' over Rhopalorhynchus. From the excellent figures given 

 of Colossendeis proboscidea it is evident that this species is very distinct from the two 

 species described as new in this report. The huge swollen rostrum, stout short legs 

 and body, closely approximated lateral processes, elevated conical oculiferous tuber- 

 cle, the proportions of the palpal joints and of the outer joints of the ambulatory 

 legs, and the very acute lanceolate spines of the accessory legs, — all these are 

 strikingly different from the corresponding characters of both C. colossea and C. 

 maceTrima. 



