662 PATAGONIAN EXPEDITIONS I ZOOLOGY. 



A. Milne-Edwards describes the rostrum of this species as bifid with 

 two lateral teeth : in most of our individuals, however, it is three-spined, 

 the median spine being entire ; only in rare cases there is a slight emar- 

 gination or notch at its distal extremity. 



ZOOGEOGRAPHICAL REMARKS. 



Among the marine forms collected by Mr. Hatcher, four groups are 

 distinguishable according to their geographical range : 



1. Cosmopolitan. 



Lepas anatifera L. 



2. West American (California to Patagonia). 



Balanus Icevis Brug. (also in the Atlantic, northward to south- 

 ern Brazil). 



3. Antarctic types. 



1. lais pubescens (Dan.), also: S. Georgia, New Zealand, 



Tasmania, Kerguelen. 



2. Exosph&roma gigas (Leach), also : New Zealand, Auck- 



land, Australia, Kerguelen. 



3. Cymodocea darwini Cunn., also : Kerguelen. 



4. Dynamene eatoni Mrs., also: Kerguelen. 



5. Cassidina emarginata M.-E., also : S. Georgia, Kerguelen. 



6. Munida subrugosa Dan., also : New Zealand, Auckland, 



Campbell, Australia. 



7. Halicarcinus planatus (F.), also : New Zealand, Auckland, 



Kerguelen, Marion, Prince Edward. 



4. Local types, restricted to so called Magellanian province. 



1 . Elminius kingi Gr. 



2. Edotia tuberculata Guer. 



3. Rocinela australiensis Sch. & Mein. 



4. Exosphceroma lanceolatum (Wh.). 



5. Serolis paradox a (F.). 



6. Lithodes antarctica Jacqu. 



7. Paralomis granulosa (Jacqu.). 



8. Munida gregaria (F.). 



9. Eurypodius latreillei Guer. 



10. Hypopeltarium spinosulum (Wh.). 



