the ' Challenge)'* Eryonidea, 223 



Specimen no. 4. — This specimen is not mentioned by Bate. 

 Median line formula as in no. 3. Lateral edge formula : 



5+3+5. 



Posterior half of tlie edge smooth. " Fur^' as in no. 1. 



Specimen no. 5. — Figured by Bate in pi. xix. C. The 

 frontal margin forms a retreating angle, at the top of which 

 the rostral spines are situated. The carapace, when seen in 

 profile, is strongly arched. Median line spine-formula: 

 1 1 112 1 1 1 C 1 1 1111. 



These spines are small. Lateral edge spine-formula : 

 10+5+23, well-developed spines. 



The smaller spines spread over the carapace are more sparsely 

 set than in nos. 1, 3, 4, and 6. The first pleosomite carries 

 dorsally a well-developed hook, and the branchial ridge, 

 wiiich is smooth in tlie other specimens, carries a row of 

 spines. 



Specimen no. 6 resembles nos. 3 and 4. Median line and 

 Ihteial edge-formulas as in no. 4. 



The conclusion I arrived at when examining the above 

 specimens is that they ougiit to be conceived as representatives 

 of four instead of one species, and I accordingly propose tlie 

 following names : — 



1. Willemoesia leptodactyla, Willemoes-Suhm, repre- 

 sented by the type-specimen no. 1. 

 2. secunda, sp. n., represented by specimen no. 2. 



3. challengeri, sp. n., represented by specimens 



nos. 3, 4, and 6. 



4. jiacifica, sp. n., represented by specimen no. 5. 



Sttreomastis suhnii, Bate. 



Bate's figure (pi. xv. fig. 3) is not very good, the form of 

 the body being, in fact, not very different from S. nana, 

 S. scidpfa, etc. 



All the nine specimens, of sizes from 31 to 45 mm., were 

 taken at Stat. 311, and evei-y one of them disjilays the same 

 median ridge spine-formuha : 



2 1 1 2 2 1 C 2 (2) (2) 2. 



Bate gives it somewhat difterently, making the two inter- 

 mediary, small, double spines appear as .single, both in tlm 



