22 CRUSTACEA MAIvACOSTRACA. III. 



had evidently not seen Harger's papers, but in a later treatise (1886) he keeps Harger's and his own 

 form as "probably" two species. In 1887 I stated that Ianthe speciosa Bov. is only a synonym for Har- 

 ger's species. Harriet Richardson, while writing the Monograph, had not seen any specimen. Not- 

 withstanding this she considered I. speciosa to be specifically distinct from Harger's /. spinosa, and copied 

 Harger's description and an extract of that given by Bovallius; in a foot-note (p. 460) she added: 

 "Since my manuscript went to press, the types of /. spinosa have been sent from Yale University, and 

 I find it distinct from /. spinosa", but as she had not seen any specimen referred to /. speciosa and 

 not any further material, the statement is of no value. And let us now look at the differences 

 between the figures given by the two authors, and compare them with my material, 8 specimens. 



According to Harger's figure his specimens had the antero-lateral processes of the head less 

 diverging, the thoracic lappets proportionately a little shorter and broader than on Bovallius' figure; 

 besides, the abdomen has no subbasal dorsal tubercle on Harger's figure. My largest specimen (from 

 the "Ingolf Stat. 29) agrees as to these particulars well with Bovallius' fig. 1, but another male from 

 Davis Strait differs more from that large specimen than from Harger's figure as to the direction 

 of the frontal processes and the shape and size of the thoracic lappets. The only feature seemingly 

 affording a specific character is the presence or absence of the dorsal abdominal tubercle. But in my 

 specimens this tubercle varies much as to length and thickness. It is rarely shaped like one of the 

 processes on the posterior thoracic segments; it is generally a little or much lower and somewhat or 

 much thicker than these processes, and in a small specimen, which has the lateral lappets as slender 

 as my largest specimen, the abdominal tubercle is low and very broad. I am inclined to think that 

 Harger's specimens possess the dorsal abdominal process as a low tubercle, and it is to be regretted 

 that Richardson did not say anything on this topic in the foot-note quoted. As a result of my material 

 and the literature I am forced to consider /. speciosa Bov. as only a synonym for Harger's species. 



It may be added that many of the numerous figures published by Bovallius, and especially 

 those representing mouth-organs, are far from accurate. On the maxillipeds (his fig. 22) he overlooked 

 the two coupling hooks, and the suture or articulation separating the long second joint from its lobe 

 does not exist. On the figure showing the maxillula (fig. 16) and the maxilla (fig. 19) the proximal 

 parts are partly omitted, partly wrong. On fig. 13, exhibiting the distal part of the left mandible, the 

 movable lobe is not marked off, the row of strong setae shows another aspect and ought not to be 

 interrupted, the molar process is too short. But I found it unnecessary to draw a new set of figures 

 of these appendages, as they did not exhibit differences worth mentioning from those of I. pulchra. 



My largest specimen, a male from the "Ingolf Stat. 29, measures 15 mm. from the tip of the 

 rostrum to the base of the uropods, 17 mm. to the end of the abdominal processes; the single female, 

 that with Spliccronclla, is I2'2 mm., or to the end of the abdominal processes, 13-2 mm. 



In a marsupium of a specimen from Davis Strait, Lat. 66°32' N., I discovered the parasitic 

 Copepod Sphceroiitilit curtipes H.J. H. described in my book on the Choniostomatidge. 



Occurrence. Taken by the "Ingolf at three stations. 



Davis Strait: Stat. 31: Lat. 66°35' N., Long. 55°54' W., 88 fath., temp. i-6°; '/ 2 spec. 

 Stat. 29: Lat. 65°34' N., Long. 54°3i' W.. 68 fath., temp. 0-2°; 1 spec. 



South-East of Iceland: Stat. 4: 64°o7' N., Long, if 12' W., 237 fath., temp. 2-5°; 1 spec. 



